Create a Node Package in es6

Create basic project

$ mkdir example
$ cd example
$ npm init

Install and config dependencies

$ npm install babel-cli babel-preset-es2015 babel-register babel-core babel-polyfill babel-loader babel-preset-stage-0 --save-dev
$ touch .babelrc

add to .babelrc

{
  "presets": ["es2015", "stage-0"]
}

Create folder structure

$ mkdir src
$ mkdir lib
$ touch src/index.js

Add to src/index.js

require('babel-polyfill');
export default class Example {
this.str = str
}

excit() {this.str}!`
}
}

add to package.json

{
"build": "babel src --out-dir lib",
"prepublish": "npm run build"
}
}
<div class=" pds-blogs-post-param pds-blogs-post-param-code">
  <script type="text/javascript" once>
    // CodeMirror, copyright (c) by Marijn Haverbeke and others
    // Distributed under an MIT license: http://codemirror.net/LICENSE

    // This is CodeMirror (http://codemirror.net), a code editor
    // implemented in JavaScript on top of the browser's DOM.
    //
    // You can find some technical background for some of the code below
    // at http://marijnhaverbeke.nl/blog/#cm-internals .

    (function(global, factory) {
      typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
        typeof define === 'function' && define.amd ? define(factory) :
        (global.CodeMirror = factory());
    }(this, (function() {
      'use strict';

      // Kludges for bugs and behavior differences that can't be feature
      // detected are enabled based on userAgent etc sniffing.
      var userAgent = navigator.userAgent;
      var platform = navigator.platform;

      var gecko = /gecko\/\d/i.test(userAgent);
      var ie_upto10 = /MSIE \d/.test(userAgent);
      var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent);
      var edge = /Edge\/(\d+)/.exec(userAgent);
      var ie = ie_upto10 || ie_11up || edge;
      var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1]);
      var webkit = !edge && /WebKit\//.test(userAgent);
      var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent);
      var chrome = !edge && /Chrome\//.test(userAgent);
      var presto = /Opera\//.test(userAgent);
      var safari = /Apple Computer/.test(navigator.vendor);
      var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent);
      var phantom = /PhantomJS/.test(userAgent);

      var ios = !edge && /AppleWebKit/.test(userAgent) && /Mobile\/\w+/.test(userAgent);
      var android = /Android/.test(userAgent);
      // This is woefully incomplete. Suggestions for alternative methods welcome.
      var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);
      var mac = ios || /Mac/.test(platform);
      var chromeOS = /\bCrOS\b/.test(userAgent);
      var windows = /win/i.test(platform);

      var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/);
      if (presto_version) {
        presto_version = Number(presto_version[1]);
      }
      if (presto_version && presto_version >= 15) {
        presto = false;
        webkit = true;
      }
      // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
      var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
      var captureRightClick = gecko || (ie && ie_version >= 9);

      function classTest(cls) {
        return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*")
      }

      var rmClass = function(node, cls) {
        var current = node.className;
        var match = classTest(cls).exec(current);
        if (match) {
          var after = current.slice(match.index + match[0].length);
          node.className = current.slice(0, match.index) + (after ? match[1] + after : "");
        }
      };

      function removeChildren(e) {
        for (var count = e.childNodes.length; count > 0; --count) {
          e.removeChild(e.firstChild);
        }
        return e
      }

      function removeChildrenAndAdd(parent, e) {
        return removeChildren(parent).appendChild(e)
      }

      function elt(tag, content, className, style) {
        var e = document.createElement(tag);
        if (className) {
          e.className = className;
        }
        if (style) {
          e.style.cssText = style;
        }
        if (typeof content == "string") {
          e.appendChild(document.createTextNode(content));
        } else if (content) {
          for (var i = 0; i < content.length; ++i) {
            e.appendChild(content[i]);
          }
        }
        return e
      }
      // wrapper for elt, which removes the elt from the accessibility tree
      function eltP(tag, content, className, style) {
        var e = elt(tag, content, className, style);
        e.setAttribute("role", "presentation");
        return e
      }

      var range;
      if (document.createRange) {
        range = function(node, start, end, endNode) {
          var r = document.createRange();
          r.setEnd(endNode || node, end);
          r.setStart(node, start);
          return r
        };
      } else {
        range = function(node, start, end) {
          var r = document.body.createTextRange();
          try {
            r.moveToElementText(node.parentNode);
          } catch (e) {
            return r
          }
          r.collapse(true);
          r.moveEnd("character", end);
          r.moveStart("character", start);
          return r
        };
      }

      function contains(parent, child) {
        if (child.nodeType == 3) // Android browser always returns false when child is a textnode
        {
          child = child.parentNode;
        }
        if (parent.contains) {
          return parent.contains(child)
        }
        do {
          if (child.nodeType == 11) {
            child = child.host;
          }
          if (child == parent) {
            return true
          }
        } while (child = child.parentNode)
      }

      function activeElt() {
        // IE and Edge may throw an "Unspecified Error" when accessing document.activeElement.
        // IE < 10 will throw when accessed while the page is loading or in an iframe.
        // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.
        var activeElement;
        try {
          activeElement = document.activeElement;
        } catch (e) {
          activeElement = document.body || null;
        }
        while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement) {
          activeElement = activeElement.shadowRoot.activeElement;
        }
        return activeElement
      }

      function addClass(node, cls) {
        var current = node.className;
        if (!classTest(cls).test(current)) {
          node.className += (current ? " " : "") + cls;
        }
      }

      function joinClasses(a, b) {
        var as = a.split(" ");
        for (var i = 0; i < as.length; i++) {
          if (as[i] && !classTest(as[i]).test(b)) {
            b += " " + as[i];
          }
        }
        return b
      }

      var selectInput = function(node) {
        node.select();
      };
      if (ios) // Mobile Safari apparently has a bug where select() is broken.
      {
        selectInput = function(node) {
          node.selectionStart = 0;
          node.selectionEnd = node.value.length;
        };
      } else if (ie) // Suppress mysterious IE10 errors
      {
        selectInput = function(node) {
          try {
            node.select();
          } catch (_e) {}
        };
      }

      function bind(f) {
        var args = Array.prototype.slice.call(arguments, 1);
        return function() {
          return f.apply(null, args)
        }
      }

      function copyObj(obj, target, overwrite) {
        if (!target) {
          target = {};
        }
        for (var prop in obj) {
          if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop))) {
            target[prop] = obj[prop];
          }
        }
        return target
      }

      // Counts the column offset in a string, taking tabs into account.
      // Used mostly to find indentation.
      function countColumn(string, end, tabSize, startIndex, startValue) {
        if (end == null) {
          end = string.search(/[^\s\u00a0]/);
          if (end == -1) {
            end = string.length;
          }
        }
        for (var i = startIndex || 0, n = startValue || 0;;) {
          var nextTab = string.indexOf("\t", i);
          if (nextTab < 0 || nextTab >= end) {
            return n + (end - i)
          }
          n += nextTab - i;
          n += tabSize - (n % tabSize);
          i = nextTab + 1;
        }
      }

      var Delayed = function() {
        this.id = null;
      };
      Delayed.prototype.set = function(ms, f) {
        clearTimeout(this.id);
        this.id = setTimeout(f, ms);
      };

      function indexOf(array, elt) {
        for (var i = 0; i < array.length; ++i) {
          if (array[i] == elt) {
            return i
          }
        }
        return -1
      }

      // Number of pixels added to scroller and sizer to hide scrollbar
      var scrollerGap = 30;

      // Returned or thrown by various protocols to signal 'I'm not
      // handling this'.
      var Pass = {
        toString: function() {
          return "CodeMirror.Pass"
        }
      };

      // Reused option objects for setSelection & friends
      var sel_dontScroll = {
        scroll: false
      };
      var sel_mouse = {
        origin: "*mouse"
      };
      var sel_move = {
        origin: "+move"
      };

      // The inverse of countColumn -- find the offset that corresponds to
      // a particular column.
      function findColumn(string, goal, tabSize) {
        for (var pos = 0, col = 0;;) {
          var nextTab = string.indexOf("\t", pos);
          if (nextTab == -1) {
            nextTab = string.length;
          }
          var skipped = nextTab - pos;
          if (nextTab == string.length || col + skipped >= goal) {
            return pos + Math.min(skipped, goal - col)
          }
          col += nextTab - pos;
          col += tabSize - (col % tabSize);
          pos = nextTab + 1;
          if (col >= goal) {
            return pos
          }
        }
      }

      var spaceStrs = [""];

      function spaceStr(n) {
        while (spaceStrs.length <= n) {
          spaceStrs.push(lst(spaceStrs) + " ");
        }
        return spaceStrs[n]
      }

      function lst(arr) {
        return arr[arr.length - 1]
      }

      function map(array, f) {
        var out = [];
        for (var i = 0; i < array.length; i++) {
          out[i] = f(array[i], i);
        }
        return out
      }

      function insertSorted(array, value, score) {
        var pos = 0,
          priority = score(value);
        while (pos < array.length && score(array[pos]) <= priority) {
          pos++;
        }
        array.splice(pos, 0, value);
      }

      function nothing() {}

      function createObj(base, props) {
        var inst;
        if (Object.create) {
          inst = Object.create(base);
        } else {
          nothing.prototype = base;
          inst = new nothing();
        }
        if (props) {
          copyObj(props, inst);
        }
        return inst
      }

      var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;

      function isWordCharBasic(ch) {
        return /\w/.test(ch) || ch > "\x80" &&
          (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))
      }

      function isWordChar(ch, helper) {
        if (!helper) {
          return isWordCharBasic(ch)
        }
        if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) {
          return true
        }
        return helper.test(ch)
      }

      function isEmpty(obj) {
        for (var n in obj) {
          if (obj.hasOwnProperty(n) && obj[n]) {
            return false
          }
        }
        return true
      }

      // Extending unicode characters. A series of a non-extending char +
      // any number of extending chars is treated as a single unit as far
      // as editing and measuring is concerned. This is not fully correct,
      // since some scripts/fonts/browsers also treat other configurations
      // of code points as a group.
      var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;

      function isExtendingChar(ch) {
        return ch.charCodeAt(0) >= 768 && extendingChars.test(ch)
      }

      // Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.
      function skipExtendingChars(str, pos, dir) {
        while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) {
          pos += dir;
        }
        return pos
      }

      // Returns the value from the range [`from`; `to`] that satisfies
      // `pred` and is closest to `from`. Assumes that at least `to`
      // satisfies `pred`. Supports `from` being greater than `to`.
      function findFirst(pred, from, to) {
        // At any point we are certain `to` satisfies `pred`, don't know
        // whether `from` does.
        var dir = from > to ? -1 : 1;
        for (;;) {
          if (from == to) {
            return from
          }
          var midF = (from + to) / 2,
            mid = dir < 0 ? Math.ceil(midF) : Math.floor(midF);
          if (mid == from) {
            return pred(mid) ? from : to
          }
          if (pred(mid)) {
            to = mid;
          } else {
            from = mid + dir;
          }
        }
      }

      // The display handles the DOM integration, both for input reading
      // and content drawing. It holds references to DOM nodes and
      // display-related state.

      function Display(place, doc, input) {
        var d = this;
        this.input = input;

        // Covers bottom-right square when both scrollbars are present.
        d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
        d.scrollbarFiller.setAttribute("cm-not-content", "true");
        // Covers bottom of gutter when coverGutterNextToScrollbar is on
        // and h scrollbar is present.
        d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
        d.gutterFiller.setAttribute("cm-not-content", "true");
        // Will contain the actual code, positioned to cover the viewport.
        d.lineDiv = eltP("div", null, "CodeMirror-code");
        // Elements are added to these to represent selection and cursors.
        d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
        d.cursorDiv = elt("div", null, "CodeMirror-cursors");
        // A visibility: hidden element used to find the size of things.
        d.measure = elt("div", null, "CodeMirror-measure");
        // When lines outside of the viewport are measured, they are drawn in this.
        d.lineMeasure = elt("div", null, "CodeMirror-measure");
        // Wraps everything that needs to exist inside the vertically-padded coordinate system
        d.lineSpace = eltP("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
          null, "position: relative; outline: none");
        var lines = eltP("div", [d.lineSpace], "CodeMirror-lines");
        // Moved around its parent to cover visible view.
        d.mover = elt("div", [lines], null, "position: relative");
        // Set to the height of the document, allowing scrolling.
        d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
        d.sizerWidth = null;
        // Behavior of elts with overflow: auto and padding is
        // inconsistent across browsers. This is used to ensure the
        // scrollable area is big enough.
        d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;");
        // Will contain the gutters, if any.
        d.gutters = elt("div", null, "CodeMirror-gutters");
        d.lineGutter = null;
        // Actual scrollable element.
        d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
        d.scroller.setAttribute("tabIndex", "-1");
        // The element in which the editor lives.
        d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");

        // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
        if (ie && ie_version < 8) {
          d.gutters.style.zIndex = -1;
          d.scroller.style.paddingRight = 0;
        }
        if (!webkit && !(gecko && mobile)) {
          d.scroller.draggable = true;
        }

        if (place) {
          if (place.appendChild) {
            place.appendChild(d.wrapper);
          } else {
            place(d.wrapper);
          }
        }

        // Current rendered range (may be bigger than the view window).
        d.viewFrom = d.viewTo = doc.first;
        d.reportedViewFrom = d.reportedViewTo = doc.first;
        // Information about the rendered lines.
        d.view = [];
        d.renderedView = null;
        // Holds info about a single rendered line when it was rendered
        // for measurement, while not in view.
        d.externalMeasured = null;
        // Empty space (in pixels) above the view
        d.viewOffset = 0;
        d.lastWrapHeight = d.lastWrapWidth = 0;
        d.updateLineNumbers = null;

        d.nativeBarWidth = d.barHeight = d.barWidth = 0;
        d.scrollbarsClipped = false;

        // Used to only resize the line number gutter when necessary (when
        // the amount of lines crosses a boundary that makes its width change)
        d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
        // Set to true when a non-horizontal-scrolling line widget is
        // added. As an optimization, line widget aligning is skipped when
        // this is false.
        d.alignWidgets = false;

        d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;

        // Tracks the maximum line length so that the horizontal scrollbar
        // can be kept static when scrolling.
        d.maxLine = null;
        d.maxLineLength = 0;
        d.maxLineChanged = false;

        // Used for measuring wheel scrolling granularity
        d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;

        // True when shift is held down.
        d.shift = false;

        // Used to track whether anything happened since the context menu
        // was opened.
        d.selForContextMenu = null;

        d.activeTouch = null;

        input.init(d);
      }

      // Find the line object corresponding to the given line number.
      function getLine(doc, n) {
        n -= doc.first;
        if (n < 0 || n >= doc.size) {
          throw new Error("There is no line " + (n + doc.first) + " in the document.")
        }
        var chunk = doc;
        while (!chunk.lines) {
          for (var i = 0;; ++i) {
            var child = chunk.children[i],
              sz = child.chunkSize();
            if (n < sz) {
              chunk = child;
              break
            }
            n -= sz;
          }
        }
        return chunk.lines[n]
      }

      // Get the part of a document between two positions, as an array of
      // strings.
      function getBetween(doc, start, end) {
        var out = [],
          n = start.line;
        doc.iter(start.line, end.line + 1, function(line) {
          var text = line.text;
          if (n == end.line) {
            text = text.slice(0, end.ch);
          }
          if (n == start.line) {
            text = text.slice(start.ch);
          }
          out.push(text);
          ++n;
        });
        return out
      }
      // Get the lines between from and to, as array of strings.
      function getLines(doc, from, to) {
        var out = [];
        doc.iter(from, to, function(line) {
          out.push(line.text);
        }); // iter aborts when callback returns truthy value
        return out
      }

      // Update the height of a line, propagating the height change
      // upwards to parent nodes.
      function updateLineHeight(line, height) {
        var diff = height - line.height;
        if (diff) {
          for (var n = line; n; n = n.parent) {
            n.height += diff;
          }
        }
      }

      // Given a line object, find its line number by walking up through
      // its parent links.
      function lineNo(line) {
        if (line.parent == null) {
          return null
        }
        var cur = line.parent,
          no = indexOf(cur.lines, line);
        for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
          for (var i = 0;; ++i) {
            if (chunk.children[i] == cur) {
              break
            }
            no += chunk.children[i].chunkSize();
          }
        }
        return no + cur.first
      }

      // Find the line at the given vertical position, using the height
      // information in the document tree.
      function lineAtHeight(chunk, h) {
        var n = chunk.first;
        outer: do {
          for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {
            var child = chunk.children[i$1],
              ch = child.height;
            if (h < ch) {
              chunk = child;
              continue outer
            }
            h -= ch;
            n += child.chunkSize();
          }
          return n
        } while (!chunk.lines)
        var i = 0;
        for (; i < chunk.lines.length; ++i) {
          var line = chunk.lines[i],
            lh = line.height;
          if (h < lh) {
            break
          }
          h -= lh;
        }
        return n + i
      }

      function isLine(doc, l) {
        return l >= doc.first && l < doc.first + doc.size
      }

      function lineNumberFor(options, i) {
        return String(options.lineNumberFormatter(i + options.firstLineNumber))
      }

      // A Pos instance represents a position within the text.
      function Pos(line, ch, sticky) {
        if (sticky === void 0) sticky = null;

        if (!(this instanceof Pos)) {
          return new Pos(line, ch, sticky)
        }
        this.line = line;
        this.ch = ch;
        this.sticky = sticky;
      }

      // Compare two positions, return 0 if they are the same, a negative
      // number when a is less, and a positive number otherwise.
      function cmp(a, b) {
        return a.line - b.line || a.ch - b.ch
      }

      function equalCursorPos(a, b) {
        return a.sticky == b.sticky && cmp(a, b) == 0
      }

      function copyPos(x) {
        return Pos(x.line, x.ch)
      }

      function maxPos(a, b) {
        return cmp(a, b) < 0 ? b : a
      }

      function minPos(a, b) {
        return cmp(a, b) < 0 ? a : b
      }

      // Most of the external API clips given positions to make sure they
      // actually exist within the document.
      function clipLine(doc, n) {
        return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))
      }

      function clipPos(doc, pos) {
        if (pos.line < doc.first) {
          return Pos(doc.first, 0)
        }
        var last = doc.first + doc.size - 1;
        if (pos.line > last) {
          return Pos(last, getLine(doc, last).text.length)
        }
        return clipToLen(pos, getLine(doc, pos.line).text.length)
      }

      function clipToLen(pos, linelen) {
        var ch = pos.ch;
        if (ch == null || ch > linelen) {
          return Pos(pos.line, linelen)
        } else if (ch < 0) {
          return Pos(pos.line, 0)
        } else {
          return pos
        }
      }

      function clipPosArray(doc, array) {
        var out = [];
        for (var i = 0; i < array.length; i++) {
          out[i] = clipPos(doc, array[i]);
        }
        return out
      }

      // Optimize some code when these features are not used.
      var sawReadOnlySpans = false;
      var sawCollapsedSpans = false;

      function seeReadOnlySpans() {
        sawReadOnlySpans = true;
      }

      function seeCollapsedSpans() {
        sawCollapsedSpans = true;
      }

      // TEXTMARKER SPANS

      function MarkedSpan(marker, from, to) {
        this.marker = marker;
        this.from = from;
        this.to = to;
      }

      // Search an array of spans for a span matching the given marker.
      function getMarkedSpanFor(spans, marker) {
        if (spans) {
          for (var i = 0; i < spans.length; ++i) {
            var span = spans[i];
            if (span.marker == marker) {
              return span
            }
          }
        }
      }
      // Remove a span from an array, returning undefined if no spans are
      // left (we don't store arrays for lines without spans).
      function removeMarkedSpan(spans, span) {
        var r;
        for (var i = 0; i < spans.length; ++i) {
          if (spans[i] != span) {
            (r || (r = [])).push(spans[i]);
          }
        }
        return r
      }
      // Add a span to a line.
      function addMarkedSpan(line, span) {
        line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
        span.marker.attachLine(line);
      }

      // Used for the algorithm that adjusts markers for a change in the
      // document. These functions cut an array of spans at a given
      // character position, returning an array of remaining chunks (or
      // undefined if nothing remains).
      function markedSpansBefore(old, startCh, isInsert) {
        var nw;
        if (old) {
          for (var i = 0; i < old.length; ++i) {
            var span = old[i],
              marker = span.marker;
            var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
            if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
              var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);
              (nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));
            }
          }
        }
        return nw
      }

      function markedSpansAfter(old, endCh, isInsert) {
        var nw;
        if (old) {
          for (var i = 0; i < old.length; ++i) {
            var span = old[i],
              marker = span.marker;
            var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
            if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
              var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);
              (nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
                span.to == null ? null : span.to - endCh));
            }
          }
        }
        return nw
      }

      // Given a change object, compute the new set of marker spans that
      // cover the line in which the change took place. Removes spans
      // entirely within the change, reconnects spans belonging to the
      // same marker that appear on both sides of the change, and cuts off
      // spans partially within the change. Returns an array of span
      // arrays with one element for each line in (after) the change.
      function stretchSpansOverChange(doc, change) {
        if (change.full) {
          return null
        }
        var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
        var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
        if (!oldFirst && !oldLast) {
          return null
        }

        var startCh = change.from.ch,
          endCh = change.to.ch,
          isInsert = cmp(change.from, change.to) == 0;
        // Get the spans that 'stick out' on both sides
        var first = markedSpansBefore(oldFirst, startCh, isInsert);
        var last = markedSpansAfter(oldLast, endCh, isInsert);

        // Next, merge those two ends
        var sameLine = change.text.length == 1,
          offset = lst(change.text).length + (sameLine ? startCh : 0);
        if (first) {
          // Fix up .to properties of first
          for (var i = 0; i < first.length; ++i) {
            var span = first[i];
            if (span.to == null) {
              var found = getMarkedSpanFor(last, span.marker);
              if (!found) {
                span.to = startCh;
              } else if (sameLine) {
                span.to = found.to == null ? null : found.to + offset;
              }
            }
          }
        }
        if (last) {
          // Fix up .from in last (or move them into first in case of sameLine)
          for (var i$1 = 0; i$1 < last.length; ++i$1) {
            var span$1 = last[i$1];
            if (span$1.to != null) {
              span$1.to += offset;
            }
            if (span$1.from == null) {
              var found$1 = getMarkedSpanFor(first, span$1.marker);
              if (!found$1) {
                span$1.from = offset;
                if (sameLine) {
                  (first || (first = [])).push(span$1);
                }
              }
            } else {
              span$1.from += offset;
              if (sameLine) {
                (first || (first = [])).push(span$1);
              }
            }
          }
        }
        // Make sure we didn't create any zero-length spans
        if (first) {
          first = clearEmptySpans(first);
        }
        if (last && last != first) {
          last = clearEmptySpans(last);
        }

        var newMarkers = [first];
        if (!sameLine) {
          // Fill gap with whole-line-spans
          var gap = change.text.length - 2,
            gapMarkers;
          if (gap > 0 && first) {
            for (var i$2 = 0; i$2 < first.length; ++i$2) {
              if (first[i$2].to == null) {
                (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null));
              }
            }
          }
          for (var i$3 = 0; i$3 < gap; ++i$3) {
            newMarkers.push(gapMarkers);
          }
          newMarkers.push(last);
        }
        return newMarkers
      }

      // Remove spans that are empty and don't have a clearWhenEmpty
      // option of false.
      function clearEmptySpans(spans) {
        for (var i = 0; i < spans.length; ++i) {
          var span = spans[i];
          if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false) {
            spans.splice(i--, 1);
          }
        }
        if (!spans.length) {
          return null
        }
        return spans
      }

      // Used to 'clip' out readOnly ranges when making a change.
      function removeReadOnlyRanges(doc, from, to) {
        var markers = null;
        doc.iter(from.line, to.line + 1, function(line) {
          if (line.markedSpans) {
            for (var i = 0; i < line.markedSpans.length; ++i) {
              var mark = line.markedSpans[i].marker;
              if (mark.readOnly && (!markers || indexOf(markers, mark) == -1)) {
                (markers || (markers = [])).push(mark);
              }
            }
          }
        });
        if (!markers) {
          return null
        }
        var parts = [{
          from: from,
          to: to
        }];
        for (var i = 0; i < markers.length; ++i) {
          var mk = markers[i],
            m = mk.find(0);
          for (var j = 0; j < parts.length; ++j) {
            var p = parts[j];
            if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) {
              continue
            }
            var newParts = [j, 1],
              dfrom = cmp(p.from, m.from),
              dto = cmp(p.to, m.to);
            if (dfrom < 0 || !mk.inclusiveLeft && !dfrom) {
              newParts.push({
                from: p.from,
                to: m.from
              });
            }
            if (dto > 0 || !mk.inclusiveRight && !dto) {
              newParts.push({
                from: m.to,
                to: p.to
              });
            }
            parts.splice.apply(parts, newParts);
            j += newParts.length - 3;
          }
        }
        return parts
      }

      // Connect or disconnect spans from a line.
      function detachMarkedSpans(line) {
        var spans = line.markedSpans;
        if (!spans) {
          return
        }
        for (var i = 0; i < spans.length; ++i) {
          spans[i].marker.detachLine(line);
        }
        line.markedSpans = null;
      }

      function attachMarkedSpans(line, spans) {
        if (!spans) {
          return
        }
        for (var i = 0; i < spans.length; ++i) {
          spans[i].marker.attachLine(line);
        }
        line.markedSpans = spans;
      }

      // Helpers used when computing which overlapping collapsed span
      // counts as the larger one.
      function extraLeft(marker) {
        return marker.inclusiveLeft ? -1 : 0
      }

      function extraRight(marker) {
        return marker.inclusiveRight ? 1 : 0
      }

      // Returns a number indicating which of two overlapping collapsed
      // spans is larger (and thus includes the other). Falls back to
      // comparing ids when the spans cover exactly the same range.
      function compareCollapsedMarkers(a, b) {
        var lenDiff = a.lines.length - b.lines.length;
        if (lenDiff != 0) {
          return lenDiff
        }
        var aPos = a.find(),
          bPos = b.find();
        var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
        if (fromCmp) {
          return -fromCmp
        }
        var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
        if (toCmp) {
          return toCmp
        }
        return b.id - a.id
      }

      // Find out whether a line ends or starts in a collapsed span. If
      // so, return the marker for that span.
      function collapsedSpanAtSide(line, start) {
        var sps = sawCollapsedSpans && line.markedSpans,
          found;
        if (sps) {
          for (var sp = (void 0), i = 0; i < sps.length; ++i) {
            sp = sps[i];
            if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
              (!found || compareCollapsedMarkers(found, sp.marker) < 0)) {
              found = sp.marker;
            }
          }
        }
        return found
      }

      function collapsedSpanAtStart(line) {
        return collapsedSpanAtSide(line, true)
      }

      function collapsedSpanAtEnd(line) {
        return collapsedSpanAtSide(line, false)
      }

      // Test whether there exists a collapsed span that partially
      // overlaps (covers the start or end, but not both) of a new span.
      // Such overlap is not allowed.
      function conflictingCollapsedRange(doc, lineNo$$1, from, to, marker) {
        var line = getLine(doc, lineNo$$1);
        var sps = sawCollapsedSpans && line.markedSpans;
        if (sps) {
          for (var i = 0; i < sps.length; ++i) {
            var sp = sps[i];
            if (!sp.marker.collapsed) {
              continue
            }
            var found = sp.marker.find(0);
            var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
            var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
            if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) {
              continue
            }
            if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||
              fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0)) {
              return true
            }
          }
        }
      }

      // A visual line is a line as drawn on the screen. Folding, for
      // example, can cause multiple logical lines to appear on the same
      // visual line. This finds the start of the visual line that the
      // given line is part of (usually that is the line itself).
      function visualLine(line) {
        var merged;
        while (merged = collapsedSpanAtStart(line)) {
          line = merged.find(-1, true).line;
        }
        return line
      }

      function visualLineEnd(line) {
        var merged;
        while (merged = collapsedSpanAtEnd(line)) {
          line = merged.find(1, true).line;
        }
        return line
      }

      // Returns an array of logical lines that continue the visual line
      // started by the argument, or undefined if there are no such lines.
      function visualLineContinued(line) {
        var merged, lines;
        while (merged = collapsedSpanAtEnd(line)) {
          line = merged.find(1, true).line;
          (lines || (lines = [])).push(line);
        }
        return lines
      }

      // Get the line number of the start of the visual line that the
      // given line number is part of.
      function visualLineNo(doc, lineN) {
        var line = getLine(doc, lineN),
          vis = visualLine(line);
        if (line == vis) {
          return lineN
        }
        return lineNo(vis)
      }

      // Get the line number of the start of the next visual line after
      // the given line.
      function visualLineEndNo(doc, lineN) {
        if (lineN > doc.lastLine()) {
          return lineN
        }
        var line = getLine(doc, lineN),
          merged;
        if (!lineIsHidden(doc, line)) {
          return lineN
        }
        while (merged = collapsedSpanAtEnd(line)) {
          line = merged.find(1, true).line;
        }
        return lineNo(line) + 1
      }

      // Compute whether a line is hidden. Lines count as hidden when they
      // are part of a visual line that starts with another line, or when
      // they are entirely covered by collapsed, non-widget span.
      function lineIsHidden(doc, line) {
        var sps = sawCollapsedSpans && line.markedSpans;
        if (sps) {
          for (var sp = (void 0), i = 0; i < sps.length; ++i) {
            sp = sps[i];
            if (!sp.marker.collapsed) {
              continue
            }
            if (sp.from == null) {
              return true
            }
            if (sp.marker.widgetNode) {
              continue
            }
            if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp)) {
              return true
            }
          }
        }
      }

      function lineIsHiddenInner(doc, line, span) {
        if (span.to == null) {
          var end = span.marker.find(1, true);
          return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))
        }
        if (span.marker.inclusiveRight && span.to == line.text.length) {
          return true
        }
        for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {
          sp = line.markedSpans[i];
          if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
            (sp.to == null || sp.to != span.from) &&
            (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
            lineIsHiddenInner(doc, line, sp)) {
            return true
          }
        }
      }

      // Find the height above the given line.
      function heightAtLine(lineObj) {
        lineObj = visualLine(lineObj);

        var h = 0,
          chunk = lineObj.parent;
        for (var i = 0; i < chunk.lines.length; ++i) {
          var line = chunk.lines[i];
          if (line == lineObj) {
            break
          } else {
            h += line.height;
          }
        }
        for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
          for (var i$1 = 0; i$1 < p.children.length; ++i$1) {
            var cur = p.children[i$1];
            if (cur == chunk) {
              break
            } else {
              h += cur.height;
            }
          }
        }
        return h
      }

      // Compute the character length of a line, taking into account
      // collapsed ranges (see markText) that might hide parts, and join
      // other lines onto it.
      function lineLength(line) {
        if (line.height == 0) {
          return 0
        }
        var len = line.text.length,
          merged, cur = line;
        while (merged = collapsedSpanAtStart(cur)) {
          var found = merged.find(0, true);
          cur = found.from.line;
          len += found.from.ch - found.to.ch;
        }
        cur = line;
        while (merged = collapsedSpanAtEnd(cur)) {
          var found$1 = merged.find(0, true);
          len -= cur.text.length - found$1.from.ch;
          cur = found$1.to.line;
          len += cur.text.length - found$1.to.ch;
        }
        return len
      }

      // Find the longest line in the document.
      function findMaxLine(cm) {
        var d = cm.display,
          doc = cm.doc;
        d.maxLine = getLine(doc, doc.first);
        d.maxLineLength = lineLength(d.maxLine);
        d.maxLineChanged = true;
        doc.iter(function(line) {
          var len = lineLength(line);
          if (len > d.maxLineLength) {
            d.maxLineLength = len;
            d.maxLine = line;
          }
        });
      }

      // BIDI HELPERS

      function iterateBidiSections(order, from, to, f) {
        if (!order) {
          return f(from, to, "ltr", 0)
        }
        var found = false;
        for (var i = 0; i < order.length; ++i) {
          var part = order[i];
          if (part.from < to && part.to > from || from == to && part.to == from) {
            f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr", i);
            found = true;
          }
        }
        if (!found) {
          f(from, to, "ltr");
        }
      }

      var bidiOther = null;

      function getBidiPartAt(order, ch, sticky) {
        var found;
        bidiOther = null;
        for (var i = 0; i < order.length; ++i) {
          var cur = order[i];
          if (cur.from < ch && cur.to > ch) {
            return i
          }
          if (cur.to == ch) {
            if (cur.from != cur.to && sticky == "before") {
              found = i;
            } else {
              bidiOther = i;
            }
          }
          if (cur.from == ch) {
            if (cur.from != cur.to && sticky != "before") {
              found = i;
            } else {
              bidiOther = i;
            }
          }
        }
        return found != null ? found : bidiOther
      }

      // Bidirectional ordering algorithm
      // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
      // that this (partially) implements.

      // One-char codes used for character types:
      // L (L):   Left-to-Right
      // R (R):   Right-to-Left
      // r (AL):  Right-to-Left Arabic
      // 1 (EN):  European Number
      // + (ES):  European Number Separator
      // % (ET):  European Number Terminator
      // n (AN):  Arabic Number
      // , (CS):  Common Number Separator
      // m (NSM): Non-Spacing Mark
      // b (BN):  Boundary Neutral
      // s (B):   Paragraph Separator
      // t (S):   Segment Separator
      // w (WS):  Whitespace
      // N (ON):  Other Neutrals

      // Returns null if characters are ordered as they appear
      // (left-to-right), or an array of sections ({from, to, level}
      // objects) in the order in which they occur visually.
      var bidiOrdering = (function() {
        // Character types for codepoints 0 to 0xff
        var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
        // Character types for codepoints 0x600 to 0x6f9
        var arabicTypes = "nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111";

        function charType(code) {
          if (code <= 0xf7) {
            return lowTypes.charAt(code)
          } else if (0x590 <= code && code <= 0x5f4) {
            return "R"
          } else if (0x600 <= code && code <= 0x6f9) {
            return arabicTypes.charAt(code - 0x600)
          } else if (0x6ee <= code && code <= 0x8ac) {
            return "r"
          } else if (0x2000 <= code && code <= 0x200b) {
            return "w"
          } else if (code == 0x200c) {
            return "b"
          } else {
            return "L"
          }
        }

        var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
        var isNeutral = /[stwN]/,
          isStrong = /[LRr]/,
          countsAsLeft = /[Lb1n]/,
          countsAsNum = /[1n]/;

        function BidiSpan(level, from, to) {
          this.level = level;
          this.from = from;
          this.to = to;
        }

        return function(str, direction) {
          var outerType = direction == "ltr" ? "L" : "R";

          if (str.length == 0 || direction == "ltr" && !bidiRE.test(str)) {
            return false
          }
          var len = str.length,
            types = [];
          for (var i = 0; i < len; ++i) {
            types.push(charType(str.charCodeAt(i)));
          }

          // W1. Examine each non-spacing mark (NSM) in the level run, and
          // change the type of the NSM to the type of the previous
          // character. If the NSM is at the start of the level run, it will
          // get the type of sor.
          for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {
            var type = types[i$1];
            if (type == "m") {
              types[i$1] = prev;
            } else {
              prev = type;
            }
          }

          // W2. Search backwards from each instance of a European number
          // until the first strong type (R, L, AL, or sor) is found. If an
          // AL is found, change the type of the European number to Arabic
          // number.
          // W3. Change all ALs to R.
          for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {
            var type$1 = types[i$2];
            if (type$1 == "1" && cur == "r") {
              types[i$2] = "n";
            } else if (isStrong.test(type$1)) {
              cur = type$1;
              if (type$1 == "r") {
                types[i$2] = "R";
              }
            }
          }

          // W4. A single European separator between two European numbers
          // changes to a European number. A single common separator between
          // two numbers of the same type changes to that type.
          for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {
            var type$2 = types[i$3];
            if (type$2 == "+" && prev$1 == "1" && types[i$3 + 1] == "1") {
              types[i$3] = "1";
            } else if (type$2 == "," && prev$1 == types[i$3 + 1] &&
              (prev$1 == "1" || prev$1 == "n")) {
              types[i$3] = prev$1;
            }
            prev$1 = type$2;
          }

          // W5. A sequence of European terminators adjacent to European
          // numbers changes to all European numbers.
          // W6. Otherwise, separators and terminators change to Other
          // Neutral.
          for (var i$4 = 0; i$4 < len; ++i$4) {
            var type$3 = types[i$4];
            if (type$3 == ",") {
              types[i$4] = "N";
            } else if (type$3 == "%") {
              var end = (void 0);
              for (end = i$4 + 1; end < len && types[end] == "%"; ++end) {}
              var replace = (i$4 && types[i$4 - 1] == "!") || (end < len && types[end] == "1") ? "1" : "N";
              for (var j = i$4; j < end; ++j) {
                types[j] = replace;
              }
              i$4 = end - 1;
            }
          }

          // W7. Search backwards from each instance of a European number
          // until the first strong type (R, L, or sor) is found. If an L is
          // found, then change the type of the European number to L.
          for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {
            var type$4 = types[i$5];
            if (cur$1 == "L" && type$4 == "1") {
              types[i$5] = "L";
            } else if (isStrong.test(type$4)) {
              cur$1 = type$4;
            }
          }

          // N1. A sequence of neutrals takes the direction of the
          // surrounding strong text if the text on both sides has the same
          // direction. European and Arabic numbers act as if they were R in
          // terms of their influence on neutrals. Start-of-level-run (sor)
          // and end-of-level-run (eor) are used at level run boundaries.
          // N2. Any remaining neutrals take the embedding direction.
          for (var i$6 = 0; i$6 < len; ++i$6) {
            if (isNeutral.test(types[i$6])) {
              var end$1 = (void 0);
              for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) {}
              var before = (i$6 ? types[i$6 - 1] : outerType) == "L";
              var after = (end$1 < len ? types[end$1] : outerType) == "L";
              var replace$1 = before == after ? (before ? "L" : "R") : outerType;
              for (var j$1 = i$6; j$1 < end$1; ++j$1) {
                types[j$1] = replace$1;
              }
              i$6 = end$1 - 1;
            }
          }

          // Here we depart from the documented algorithm, in order to avoid
          // building up an actual levels array. Since there are only three
          // levels (0, 1, 2) in an implementation that doesn't take
          // explicit embedding into account, we can build up the order on
          // the fly, without following the level-based algorithm.
          var order = [],
            m;
          for (var i$7 = 0; i$7 < len;) {
            if (countsAsLeft.test(types[i$7])) {
              var start = i$7;
              for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {}
              order.push(new BidiSpan(0, start, i$7));
            } else {
              var pos = i$7,
                at = order.length;
              for (++i$7; i$7 < len && types[i$7] != "L"; ++i$7) {}
              for (var j$2 = pos; j$2 < i$7;) {
                if (countsAsNum.test(types[j$2])) {
                  if (pos < j$2) {
                    order.splice(at, 0, new BidiSpan(1, pos, j$2));
                  }
                  var nstart = j$2;
                  for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {}
                  order.splice(at, 0, new BidiSpan(2, nstart, j$2));
                  pos = j$2;
                } else {
                  ++j$2;
                }
              }
              if (pos < i$7) {
                order.splice(at, 0, new BidiSpan(1, pos, i$7));
              }
            }
          }
          if (direction == "ltr") {
            if (order[0].level == 1 && (m = str.match(/^\s+/))) {
              order[0].from = m[0].length;
              order.unshift(new BidiSpan(0, 0, m[0].length));
            }
            if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
              lst(order).to -= m[0].length;
              order.push(new BidiSpan(0, len - m[0].length, len));
            }
          }

          return direction == "rtl" ? order.reverse() : order
        }
      })();

      // Get the bidi ordering for the given line (and cache it). Returns
      // false for lines that are fully left-to-right, and an array of
      // BidiSpan objects otherwise.
      function getOrder(line, direction) {
        var order = line.order;
        if (order == null) {
          order = line.order = bidiOrdering(line.text, direction);
        }
        return order
      }

      // EVENT HANDLING

      // Lightweight event framework. on/off also work on DOM nodes,
      // registering native DOM handlers.

      var noHandlers = [];

      var on = function(emitter, type, f) {
        if (emitter.addEventListener) {
          emitter.addEventListener(type, f, false);
        } else if (emitter.attachEvent) {
          emitter.attachEvent("on" + type, f);
        } else {
          var map$$1 = emitter._handlers || (emitter._handlers = {});
          map$$1[type] = (map$$1[type] || noHandlers).concat(f);
        }
      };

      function getHandlers(emitter, type) {
        return emitter._handlers && emitter._handlers[type] || noHandlers
      }

      function off(emitter, type, f) {
        if (emitter.removeEventListener) {
          emitter.removeEventListener(type, f, false);
        } else if (emitter.detachEvent) {
          emitter.detachEvent("on" + type, f);
        } else {
          var map$$1 = emitter._handlers,
            arr = map$$1 && map$$1[type];
          if (arr) {
            var index = indexOf(arr, f);
            if (index > -1) {
              map$$1[type] = arr.slice(0, index).concat(arr.slice(index + 1));
            }
          }
        }
      }

      function signal(emitter, type /*, values...*/ ) {
        var handlers = getHandlers(emitter, type);
        if (!handlers.length) {
          return
        }
        var args = Array.prototype.slice.call(arguments, 2);
        for (var i = 0; i < handlers.length; ++i) {
          handlers[i].apply(null, args);
        }
      }

      // The DOM events that CodeMirror handles can be overridden by
      // registering a (non-DOM) handler on the editor for the event name,
      // and preventDefault-ing the event in that handler.
      function signalDOMEvent(cm, e, override) {
        if (typeof e == "string") {
          e = {
            type: e,
            preventDefault: function() {
              this.defaultPrevented = true;
            }
          };
        }
        signal(cm, override || e.type, cm, e);
        return e_defaultPrevented(e) || e.codemirrorIgnore
      }

      function signalCursorActivity(cm) {
        var arr = cm._handlers && cm._handlers.cursorActivity;
        if (!arr) {
          return
        }
        var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
        for (var i = 0; i < arr.length; ++i) {
          if (indexOf(set, arr[i]) == -1) {
            set.push(arr[i]);
          }
        }
      }

      function hasHandler(emitter, type) {
        return getHandlers(emitter, type).length > 0
      }

      // Add on and off methods to a constructor's prototype, to make
      // registering events on such objects more convenient.
      function eventMixin(ctor) {
        ctor.prototype.on = function(type, f) {
          on(this, type, f);
        };
        ctor.prototype.off = function(type, f) {
          off(this, type, f);
        };
      }

      // Due to the fact that we still support jurassic IE versions, some
      // compatibility wrappers are needed.

      function e_preventDefault(e) {
        if (e.preventDefault) {
          e.preventDefault();
        } else {
          e.returnValue = false;
        }
      }

      function e_stopPropagation(e) {
        if (e.stopPropagation) {
          e.stopPropagation();
        } else {
          e.cancelBubble = true;
        }
      }

      function e_defaultPrevented(e) {
        return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
      }

      function e_stop(e) {
        e_preventDefault(e);
        e_stopPropagation(e);
      }

      function e_target(e) {
        return e.target || e.srcElement
      }

      function e_button(e) {
        var b = e.which;
        if (b == null) {
          if (e.button & 1) {
            b = 1;
          } else if (e.button & 2) {
            b = 3;
          } else if (e.button & 4) {
            b = 2;
          }
        }
        if (mac && e.ctrlKey && b == 1) {
          b = 3;
        }
        return b
      }

      // Detect drag-and-drop
      var dragAndDrop = function() {
        // There is *some* kind of drag-and-drop support in IE6-8, but I
        // couldn't get it to work yet.
        if (ie && ie_version < 9) {
          return false
        }
        var div = elt('div');
        return "draggable" in div || "dragDrop" in div
      }();

      var zwspSupported;

      function zeroWidthElement(measure) {
        if (zwspSupported == null) {
          var test = elt("span", "\u200b");
          removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
          if (measure.firstChild.offsetHeight != 0) {
            zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8);
          }
        }
        var node = zwspSupported ? elt("span", "\u200b") :
          elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
        node.setAttribute("cm-text", "");
        return node
      }

      // Feature-detect IE's crummy client rect reporting for bidi text
      var badBidiRects;

      function hasBadBidiRects(measure) {
        if (badBidiRects != null) {
          return badBidiRects
        }
        var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
        var r0 = range(txt, 0, 1).getBoundingClientRect();
        var r1 = range(txt, 1, 2).getBoundingClientRect();
        removeChildren(measure);
        if (!r0 || r0.left == r0.right) {
          return false
        } // Safari returns null in some cases (#2780)
        return badBidiRects = (r1.right - r0.right < 3)
      }

      // See if "".split is the broken IE version, if so, provide an
      // alternative way to split lines.
      var splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? function(string) {
        var pos = 0,
          result = [],
          l = string.length;
        while (pos <= l) {
          var nl = string.indexOf("\n", pos);
          if (nl == -1) {
            nl = string.length;
          }
          var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
          var rt = line.indexOf("\r");
          if (rt != -1) {
            result.push(line.slice(0, rt));
            pos += rt + 1;
          } else {
            result.push(line);
            pos = nl + 1;
          }
        }
        return result
      } : function(string) {
        return string.split(/\r\n?|\n/);
      };

      var hasSelection = window.getSelection ? function(te) {
        try {
          return te.selectionStart != te.selectionEnd
        } catch (e) {
          return false
        }
      } : function(te) {
        var range$$1;
        try {
          range$$1 = te.ownerDocument.selection.createRange();
        } catch (e) {}
        if (!range$$1 || range$$1.parentElement() != te) {
          return false
        }
        return range$$1.compareEndPoints("StartToEnd", range$$1) != 0
      };

      var hasCopyEvent = (function() {
        var e = elt("div");
        if ("oncopy" in e) {
          return true
        }
        e.setAttribute("oncopy", "return;");
        return typeof e.oncopy == "function"
      })();

      var badZoomedRects = null;

      function hasBadZoomedRects(measure) {
        if (badZoomedRects != null) {
          return badZoomedRects
        }
        var node = removeChildrenAndAdd(measure, elt("span", "x"));
        var normal = node.getBoundingClientRect();
        var fromRange = range(node, 0, 1).getBoundingClientRect();
        return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1
      }

      // Known modes, by name and by MIME
      var modes = {};
      var mimeModes = {};

      // Extra arguments are stored as the mode's dependencies, which is
      // used by (legacy) mechanisms like loadmode.js to automatically
      // load a mode. (Preferred mechanism is the require/define calls.)
      function defineMode(name, mode) {
        if (arguments.length > 2) {
          mode.dependencies = Array.prototype.slice.call(arguments, 2);
        }
        modes[name] = mode;
      }

      function defineMIME(mime, spec) {
        mimeModes[mime] = spec;
      }

      // Given a MIME type, a {name, ...options} config object, or a name
      // string, return a mode config object.
      function resolveMode(spec) {
        if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
          spec = mimeModes[spec];
        } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
          var found = mimeModes[spec.name];
          if (typeof found == "string") {
            found = {
              name: found
            };
          }
          spec = createObj(found, spec);
          spec.name = found.name;
        } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
          return resolveMode("application/xml")
        } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+json$/.test(spec)) {
          return resolveMode("application/json")
        }
        if (typeof spec == "string") {
          return {
            name: spec
          }
        } else {
          return spec || {
            name: "null"
          }
        }
      }

      // Given a mode spec (anything that resolveMode accepts), find and
      // initialize an actual mode object.
      function getMode(options, spec) {
        spec = resolveMode(spec);
        var mfactory = modes[spec.name];
        if (!mfactory) {
          return getMode(options, "text/plain")
        }
        var modeObj = mfactory(options, spec);
        if (modeExtensions.hasOwnProperty(spec.name)) {
          var exts = modeExtensions[spec.name];
          for (var prop in exts) {
            if (!exts.hasOwnProperty(prop)) {
              continue
            }
            if (modeObj.hasOwnProperty(prop)) {
              modeObj["_" + prop] = modeObj[prop];
            }
            modeObj[prop] = exts[prop];
          }
        }
        modeObj.name = spec.name;
        if (spec.helperType) {
          modeObj.helperType = spec.helperType;
        }
        if (spec.modeProps) {
          for (var prop$1 in spec.modeProps) {
            modeObj[prop$1] = spec.modeProps[prop$1];
          }
        }

        return modeObj
      }

      // This can be used to attach properties to mode objects from
      // outside the actual mode definition.
      var modeExtensions = {};

      function extendMode(mode, properties) {
        var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
        copyObj(properties, exts);
      }

      function copyState(mode, state) {
        if (state === true) {
          return state
        }
        if (mode.copyState) {
          return mode.copyState(state)
        }
        var nstate = {};
        for (var n in state) {
          var val = state[n];
          if (val instanceof Array) {
            val = val.concat([]);
          }
          nstate[n] = val;
        }
        return nstate
      }

      // Given a mode and a state (for that mode), find the inner mode and
      // state at the position that the state refers to.
      function innerMode(mode, state) {
        var info;
        while (mode.innerMode) {
          info = mode.innerMode(state);
          if (!info || info.mode == mode) {
            break
          }
          state = info.state;
          mode = info.mode;
        }
        return info || {
          mode: mode,
          state: state
        }
      }

      function startState(mode, a1, a2) {
        return mode.startState ? mode.startState(a1, a2) : true
      }

      // STRING STREAM

      // Fed to the mode parsers, provides helper functions to make
      // parsers more succinct.

      var StringStream = function(string, tabSize, lineOracle) {
        this.pos = this.start = 0;
        this.string = string;
        this.tabSize = tabSize || 8;
        this.lastColumnPos = this.lastColumnValue = 0;
        this.lineStart = 0;
        this.lineOracle = lineOracle;
      };

      StringStream.prototype.eol = function() {
        return this.pos >= this.string.length
      };
      StringStream.prototype.sol = function() {
        return this.pos == this.lineStart
      };
      StringStream.prototype.peek = function() {
        return this.string.charAt(this.pos) || undefined
      };
      StringStream.prototype.next = function() {
        if (this.pos < this.string.length) {
          return this.string.charAt(this.pos++)
        }
      };
      StringStream.prototype.eat = function(match) {
        var ch = this.string.charAt(this.pos);
        var ok;
        if (typeof match == "string") {
          ok = ch == match;
        } else {
          ok = ch && (match.test ? match.test(ch) : match(ch));
        }
        if (ok) {
          ++this.pos;
          return ch
        }
      };
      StringStream.prototype.eatWhile = function(match) {
        var start = this.pos;
        while (this.eat(match)) {}
        return this.pos > start
      };
      StringStream.prototype.eatSpace = function() {
        var this$1 = this;

        var start = this.pos;
        while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) {
          ++this$1.pos;
        }
        return this.pos > start
      };
      StringStream.prototype.skipToEnd = function() {
        this.pos = this.string.length;
      };
      StringStream.prototype.skipTo = function(ch) {
        var found = this.string.indexOf(ch, this.pos);
        if (found > -1) {
          this.pos = found;
          return true
        }
      };
      StringStream.prototype.backUp = function(n) {
        this.pos -= n;
      };
      StringStream.prototype.column = function() {
        if (this.lastColumnPos < this.start) {
          this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
          this.lastColumnPos = this.start;
        }
        return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
      };
      StringStream.prototype.indentation = function() {
        return countColumn(this.string, null, this.tabSize) -
          (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
      };
      StringStream.prototype.match = function(pattern, consume, caseInsensitive) {
        if (typeof pattern == "string") {
          var cased = function(str) {
            return caseInsensitive ? str.toLowerCase() : str;
          };
          var substr = this.string.substr(this.pos, pattern.length);
          if (cased(substr) == cased(pattern)) {
            if (consume !== false) {
              this.pos += pattern.length;
            }
            return true
          }
        } else {
          var match = this.string.slice(this.pos).match(pattern);
          if (match && match.index > 0) {
            return null
          }
          if (match && consume !== false) {
            this.pos += match[0].length;
          }
          return match
        }
      };
      StringStream.prototype.current = function() {
        return this.string.slice(this.start, this.pos)
      };
      StringStream.prototype.hideFirstChars = function(n, inner) {
        this.lineStart += n;
        try {
          return inner()
        } finally {
          this.lineStart -= n;
        }
      };
      StringStream.prototype.lookAhead = function(n) {
        var oracle = this.lineOracle;
        return oracle && oracle.lookAhead(n)
      };
      StringStream.prototype.baseToken = function() {
        var oracle = this.lineOracle;
        return oracle && oracle.baseToken(this.pos)
      };

      var SavedContext = function(state, lookAhead) {
        this.state = state;
        this.lookAhead = lookAhead;
      };

      var Context = function(doc, state, line, lookAhead) {
        this.state = state;
        this.doc = doc;
        this.line = line;
        this.maxLookAhead = lookAhead || 0;
        this.baseTokens = null;
        this.baseTokenPos = 1;
      };

      Context.prototype.lookAhead = function(n) {
        var line = this.doc.getLine(this.line + n);
        if (line != null && n > this.maxLookAhead) {
          this.maxLookAhead = n;
        }
        return line
      };

      Context.prototype.baseToken = function(n) {
        var this$1 = this;

        if (!this.baseTokens) {
          return null
        }
        while (this.baseTokens[this.baseTokenPos] <= n) {
          this$1.baseTokenPos += 2;
        }
        var type = this.baseTokens[this.baseTokenPos + 1];
        return {
          type: type && type.replace(/( |^)overlay .*/, ""),
          size: this.baseTokens[this.baseTokenPos] - n
        }
      };

      Context.prototype.nextLine = function() {
        this.line++;
        if (this.maxLookAhead > 0) {
          this.maxLookAhead--;
        }
      };

      Context.fromSaved = function(doc, saved, line) {
        if (saved instanceof SavedContext) {
          return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead)
        } else {
          return new Context(doc, copyState(doc.mode, saved), line)
        }
      };

      Context.prototype.save = function(copy) {
        var state = copy !== false ? copyState(this.doc.mode, this.state) : this.state;
        return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state
      };


      // Compute a style array (an array starting with a mode generation
      // -- for invalidation -- followed by pairs of end positions and
      // style strings), which is used to highlight the tokens on the
      // line.
      function highlightLine(cm, line, context, forceToEnd) {
        // A styles array always starts with a number identifying the
        // mode/overlays that it is based on (for easy invalidation).
        var st = [cm.state.modeGen],
          lineClasses = {};
        // Compute the base array of styles
        runMode(cm, line.text, cm.doc.mode, context, function(end, style) {
            return st.push(end, style);
          },
          lineClasses, forceToEnd);
        var state = context.state;

        // Run overlays, adjust style array.
        var loop = function(o) {
          context.baseTokens = st;
          var overlay = cm.state.overlays[o],
            i = 1,
            at = 0;
          context.state = true;
          runMode(cm, line.text, overlay.mode, context, function(end, style) {
            var start = i;
            // Ensure there's a token end at the current position, and that i points at it
            while (at < end) {
              var i_end = st[i];
              if (i_end > end) {
                st.splice(i, 1, end, st[i + 1], i_end);
              }
              i += 2;
              at = Math.min(end, i_end);
            }
            if (!style) {
              return
            }
            if (overlay.opaque) {
              st.splice(start, i - start, end, "overlay " + style);
              i = start + 2;
            } else {
              for (; start < i; start += 2) {
                var cur = st[start + 1];
                st[start + 1] = (cur ? cur + " " : "") + "overlay " + style;
              }
            }
          }, lineClasses);
          context.state = state;
          context.baseTokens = null;
          context.baseTokenPos = 1;
        };

        for (var o = 0; o < cm.state.overlays.length; ++o) loop(o);

        return {
          styles: st,
          classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null
        }
      }

      function getLineStyles(cm, line, updateFrontier) {
        if (!line.styles || line.styles[0] != cm.state.modeGen) {
          var context = getContextBefore(cm, lineNo(line));
          var resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state);
          var result = highlightLine(cm, line, context);
          if (resetState) {
            context.state = resetState;
          }
          line.stateAfter = context.save(!resetState);
          line.styles = result.styles;
          if (result.classes) {
            line.styleClasses = result.classes;
          } else if (line.styleClasses) {
            line.styleClasses = null;
          }
          if (updateFrontier === cm.doc.highlightFrontier) {
            cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier);
          }
        }
        return line.styles
      }

      function getContextBefore(cm, n, precise) {
        var doc = cm.doc,
          display = cm.display;
        if (!doc.mode.startState) {
          return new Context(doc, true, n)
        }
        var start = findStartLine(cm, n, precise);
        var saved = start > doc.first && getLine(doc, start - 1).stateAfter;
        var context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start);

        doc.iter(start, n, function(line) {
          processLine(cm, line.text, context);
          var pos = context.line;
          line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null;
          context.nextLine();
        });
        if (precise) {
          doc.modeFrontier = context.line;
        }
        return context
      }

      // Lightweight form of highlight -- proceed over this line and
      // update state, but don't save a style array. Used for lines that
      // aren't currently visible.
      function processLine(cm, text, context, startAt) {
        var mode = cm.doc.mode;
        var stream = new StringStream(text, cm.options.tabSize, context);
        stream.start = stream.pos = startAt || 0;
        if (text == "") {
          callBlankLine(mode, context.state);
        }
        while (!stream.eol()) {
          readToken(mode, stream, context.state);
          stream.start = stream.pos;
        }
      }

      function callBlankLine(mode, state) {
        if (mode.blankLine) {
          return mode.blankLine(state)
        }
        if (!mode.innerMode) {
          return
        }
        var inner = innerMode(mode, state);
        if (inner.mode.blankLine) {
          return inner.mode.blankLine(inner.state)
        }
      }

      function readToken(mode, stream, state, inner) {
        for (var i = 0; i < 10; i++) {
          if (inner) {
            inner[0] = innerMode(mode, state).mode;
          }
          var style = mode.token(stream, state);
          if (stream.pos > stream.start) {
            return style
          }
        }
        throw new Error("Mode " + mode.name + " failed to advance stream.")
      }

      var Token = function(stream, type, state) {
        this.start = stream.start;
        this.end = stream.pos;
        this.string = stream.current();
        this.type = type || null;
        this.state = state;
      };

      // Utility for getTokenAt and getLineTokens
      function takeToken(cm, pos, precise, asArray) {
        var doc = cm.doc,
          mode = doc.mode,
          style;
        pos = clipPos(doc, pos);
        var line = getLine(doc, pos.line),
          context = getContextBefore(cm, pos.line, precise);
        var stream = new StringStream(line.text, cm.options.tabSize, context),
          tokens;
        if (asArray) {
          tokens = [];
        }
        while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
          stream.start = stream.pos;
          style = readToken(mode, stream, context.state);
          if (asArray) {
            tokens.push(new Token(stream, style, copyState(doc.mode, context.state)));
          }
        }
        return asArray ? tokens : new Token(stream, style, context.state)
      }

      function extractLineClasses(type, output) {
        if (type) {
          for (;;) {
            var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/);
            if (!lineClass) {
              break
            }
            type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);
            var prop = lineClass[1] ? "bgClass" : "textClass";
            if (output[prop] == null) {
              output[prop] = lineClass[2];
            } else if (!(new RegExp("(?:^|\s)" + lineClass[2] + "(?:$|\s)")).test(output[prop])) {
              output[prop] += " " + lineClass[2];
            }
          }
        }
        return type
      }

      // Run the given mode's parser over a line, calling f for each token.
      function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {
        var flattenSpans = mode.flattenSpans;
        if (flattenSpans == null) {
          flattenSpans = cm.options.flattenSpans;
        }
        var curStart = 0,
          curStyle = null;
        var stream = new StringStream(text, cm.options.tabSize, context),
          style;
        var inner = cm.options.addModeClass && [null];
        if (text == "") {
          extractLineClasses(callBlankLine(mode, context.state), lineClasses);
        }
        while (!stream.eol()) {
          if (stream.pos > cm.options.maxHighlightLength) {
            flattenSpans = false;
            if (forceToEnd) {
              processLine(cm, text, context, stream.pos);
            }
            stream.pos = text.length;
            style = null;
          } else {
            style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses);
          }
          if (inner) {
            var mName = inner[0].name;
            if (mName) {
              style = "m-" + (style ? mName + " " + style : mName);
            }
          }
          if (!flattenSpans || curStyle != style) {
            while (curStart < stream.start) {
              curStart = Math.min(stream.start, curStart + 5000);
              f(curStart, curStyle);
            }
            curStyle = style;
          }
          stream.start = stream.pos;
        }
        while (curStart < stream.pos) {
          // Webkit seems to refuse to render text nodes longer than 57444
          // characters, and returns inaccurate measurements in nodes
          // starting around 5000 chars.
          var pos = Math.min(stream.pos, curStart + 5000);
          f(pos, curStyle);
          curStart = pos;
        }
      }

      // Finds the line to start with when starting a parse. Tries to
      // find a line with a stateAfter, so that it can start with a
      // valid state. If that fails, it returns the line with the
      // smallest indentation, which tends to need the least context to
      // parse correctly.
      function findStartLine(cm, n, precise) {
        var minindent, minline, doc = cm.doc;
        var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
        for (var search = n; search > lim; --search) {
          if (search <= doc.first) {
            return doc.first
          }
          var line = getLine(doc, search - 1),
            after = line.stateAfter;
          if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier)) {
            return search
          }
          var indented = countColumn(line.text, null, cm.options.tabSize);
          if (minline == null || minindent > indented) {
            minline = search - 1;
            minindent = indented;
          }
        }
        return minline
      }

      function retreatFrontier(doc, n) {
        doc.modeFrontier = Math.min(doc.modeFrontier, n);
        if (doc.highlightFrontier < n - 10) {
          return
        }
        var start = doc.first;
        for (var line = n - 1; line > start; line--) {
          var saved = getLine(doc, line).stateAfter;
          // change is on 3
          // state on line 1 looked ahead 2 -- so saw 3
          // test 1 + 2 < 3 should cover this
          if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {
            start = line + 1;
            break
          }
        }
        doc.highlightFrontier = Math.min(doc.highlightFrontier, start);
      }

      // LINE DATA STRUCTURE

      // Line objects. These hold state related to a line, including
      // highlighting info (the styles array).
      var Line = function(text, markedSpans, estimateHeight) {
        this.text = text;
        attachMarkedSpans(this, markedSpans);
        this.height = estimateHeight ? estimateHeight(this) : 1;
      };

      Line.prototype.lineNo = function() {
        return lineNo(this)
      };
      eventMixin(Line);

      // Change the content (text, markers) of a line. Automatically
      // invalidates cached information and tries to re-estimate the
      // line's height.
      function updateLine(line, text, markedSpans, estimateHeight) {
        line.text = text;
        if (line.stateAfter) {
          line.stateAfter = null;
        }
        if (line.styles) {
          line.styles = null;
        }
        if (line.order != null) {
          line.order = null;
        }
        detachMarkedSpans(line);
        attachMarkedSpans(line, markedSpans);
        var estHeight = estimateHeight ? estimateHeight(line) : 1;
        if (estHeight != line.height) {
          updateLineHeight(line, estHeight);
        }
      }

      // Detach a line from the document tree and its markers.
      function cleanUpLine(line) {
        line.parent = null;
        detachMarkedSpans(line);
      }

      // Convert a style as returned by a mode (either null, or a string
      // containing one or more styles) to a CSS style. This is cached,
      // and also looks for line-wide styles.
      var styleToClassCache = {};
      var styleToClassCacheWithMode = {};

      function interpretTokenStyle(style, options) {
        if (!style || /^\s*$/.test(style)) {
          return null
        }
        var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
        return cache[style] ||
          (cache[style] = style.replace(/\S+/g, "cm-$&"))
      }

      // Render the DOM representation of the text of a line. Also builds
      // up a 'line map', which points at the DOM nodes that represent
      // specific stretches of text, and is used by the measuring code.
      // The returned object contains the DOM node, this map, and
      // information about line-wide styles that were set by the mode.
      function buildLineContent(cm, lineView) {
        // The padding-right forces the element to have a 'border', which
        // is needed on Webkit to be able to get line-level bounding
        // rectangles for it (in measureChar).
        var content = eltP("span", null, null, webkit ? "padding-right: .1px" : null);
        var builder = {
          pre: eltP("pre", [content], "CodeMirror-line"),
          content: content,
          col: 0,
          pos: 0,
          cm: cm,
          trailingSpace: false,
          splitSpaces: (ie || webkit) && cm.getOption("lineWrapping")
        };
        lineView.measure = {};

        // Iterate over the logical lines that make up this visual line.
        for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
          var line = i ? lineView.rest[i - 1] : lineView.line,
            order = (void 0);
          builder.pos = 0;
          builder.addToken = buildToken;
          // Optionally wire in some hacks into the token-rendering
          // algorithm, to deal with browser quirks.
          if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction))) {
            builder.addToken = buildTokenBadBidi(builder.addToken, order);
          }
          builder.map = [];
          var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
          insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
          if (line.styleClasses) {
            if (line.styleClasses.bgClass) {
              builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || "");
            }
            if (line.styleClasses.textClass) {
              builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || "");
            }
          }

          // Ensure at least a single node is present, for measuring.
          if (builder.map.length == 0) {
            builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure)));
          }

          // Store the map and a cache object for the current logical line
          if (i == 0) {
            lineView.measure.map = builder.map;
            lineView.measure.cache = {};
          } else {
            (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map);
            (lineView.measure.caches || (lineView.measure.caches = [])).push({});
          }
        }

        // See issue #2901
        if (webkit) {
          var last = builder.content.lastChild;
          if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab"))) {
            builder.content.className = "cm-tab-wrap-hack";
          }
        }

        signal(cm, "renderLine", cm, lineView.line, builder.pre);
        if (builder.pre.className) {
          builder.textClass = joinClasses(builder.pre.className, builder.textClass || "");
        }

        return builder
      }

      function defaultSpecialCharPlaceholder(ch) {
        var token = elt("span", "\u2022", "cm-invalidchar");
        token.title = "\\u" + ch.charCodeAt(0).toString(16);
        token.setAttribute("aria-label", token.title);
        return token
      }

      // Build up the DOM representation for a single token, and add it to
      // the line map. Takes care to render special characters separately.
      function buildToken(builder, text, style, startStyle, endStyle, title, css) {
        if (!text) {
          return
        }
        var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text;
        var special = builder.cm.state.specialChars,
          mustWrap = false;
        var content;
        if (!special.test(text)) {
          builder.col += text.length;
          content = document.createTextNode(displayText);
          builder.map.push(builder.pos, builder.pos + text.length, content);
          if (ie && ie_version < 9) {
            mustWrap = true;
          }
          builder.pos += text.length;
        } else {
          content = document.createDocumentFragment();
          var pos = 0;
          while (true) {
            special.lastIndex = pos;
            var m = special.exec(text);
            var skipped = m ? m.index - pos : text.length - pos;
            if (skipped) {
              var txt = document.createTextNode(displayText.slice(pos, pos + skipped));
              if (ie && ie_version < 9) {
                content.appendChild(elt("span", [txt]));
              } else {
                content.appendChild(txt);
              }
              builder.map.push(builder.pos, builder.pos + skipped, txt);
              builder.col += skipped;
              builder.pos += skipped;
            }
            if (!m) {
              break
            }
            pos += skipped + 1;
            var txt$1 = (void 0);
            if (m[0] == "\t") {
              var tabSize = builder.cm.options.tabSize,
                tabWidth = tabSize - builder.col % tabSize;
              txt$1 = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
              txt$1.setAttribute("role", "presentation");
              txt$1.setAttribute("cm-text", "\t");
              builder.col += tabWidth;
            } else if (m[0] == "\r" || m[0] == "\n") {
              txt$1 = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"));
              txt$1.setAttribute("cm-text", m[0]);
              builder.col += 1;
            } else {
              txt$1 = builder.cm.options.specialCharPlaceholder(m[0]);
              txt$1.setAttribute("cm-text", m[0]);
              if (ie && ie_version < 9) {
                content.appendChild(elt("span", [txt$1]));
              } else {
                content.appendChild(txt$1);
              }
              builder.col += 1;
            }
            builder.map.push(builder.pos, builder.pos + 1, txt$1);
            builder.pos++;
          }
        }
        builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32;
        if (style || startStyle || endStyle || mustWrap || css) {
          var fullStyle = style || "";
          if (startStyle) {
            fullStyle += startStyle;
          }
          if (endStyle) {
            fullStyle += endStyle;
          }
          var token = elt("span", [content], fullStyle, css);
          if (title) {
            token.title = title;
          }
          return builder.content.appendChild(token)
        }
        builder.content.appendChild(content);
      }

      function splitSpaces(text, trailingBefore) {
        if (text.length > 1 && !/  /.test(text)) {
          return text
        }
        var spaceBefore = trailingBefore,
          result = "";
        for (var i = 0; i < text.length; i++) {
          var ch = text.charAt(i);
          if (ch == " " && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32)) {
            ch = "\u00a0";
          }
          result += ch;
          spaceBefore = ch == " ";
        }
        return result
      }

      // Work around nonsense dimensions being reported for stretches of
      // right-to-left text.
      function buildTokenBadBidi(inner, order) {
        return function(builder, text, style, startStyle, endStyle, title, css) {
          style = style ? style + " cm-force-border" : "cm-force-border";
          var start = builder.pos,
            end = start + text.length;
          for (;;) {
            // Find the part that overlaps with the start of this text
            var part = (void 0);
            for (var i = 0; i < order.length; i++) {
              part = order[i];
              if (part.to > start && part.from <= start) {
                break
              }
            }
            if (part.to >= end) {
              return inner(builder, text, style, startStyle, endStyle, title, css)
            }
            inner(builder, text.slice(0, part.to - start), style, startStyle, null, title, css);
            startStyle = null;
            text = text.slice(part.to - start);
            start = part.to;
          }
        }
      }

      function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
        var widget = !ignoreWidget && marker.widgetNode;
        if (widget) {
          builder.map.push(builder.pos, builder.pos + size, widget);
        }
        if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
          if (!widget) {
            widget = builder.content.appendChild(document.createElement("span"));
          }
          widget.setAttribute("cm-marker", marker.id);
        }
        if (widget) {
          builder.cm.display.input.setUneditable(widget);
          builder.content.appendChild(widget);
        }
        builder.pos += size;
        builder.trailingSpace = false;
      }

      // Outputs a number of spans to make up a line, taking highlighting
      // and marked text into account.
      function insertLineContent(line, builder, styles) {
        var spans = line.markedSpans,
          allText = line.text,
          at = 0;
        if (!spans) {
          for (var i$1 = 1; i$1 < styles.length; i$1 += 2) {
            builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1 + 1], builder.cm.options));
          }
          return
        }

        var len = allText.length,
          pos = 0,
          i = 1,
          text = "",
          style, css;
        var nextChange = 0,
          spanStyle, spanEndStyle, spanStartStyle, title, collapsed;
        for (;;) {
          if (nextChange == pos) { // Update current marker set
            spanStyle = spanEndStyle = spanStartStyle = title = css = "";
            collapsed = null;
            nextChange = Infinity;
            var foundBookmarks = [],
              endStyles = (void 0);
            for (var j = 0; j < spans.length; ++j) {
              var sp = spans[j],
                m = sp.marker;
              if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
                foundBookmarks.push(m);
              } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
                if (sp.to != null && sp.to != pos && nextChange > sp.to) {
                  nextChange = sp.to;
                  spanEndStyle = "";
                }
                if (m.className) {
                  spanStyle += " " + m.className;
                }
                if (m.css) {
                  css = (css ? css + ";" : "") + m.css;
                }
                if (m.startStyle && sp.from == pos) {
                  spanStartStyle += " " + m.startStyle;
                }
                if (m.endStyle && sp.to == nextChange) {
                  (endStyles || (endStyles = [])).push(m.endStyle, sp.to);
                }
                if (m.title && !title) {
                  title = m.title;
                }
                if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0)) {
                  collapsed = sp;
                }
              } else if (sp.from > pos && nextChange > sp.from) {
                nextChange = sp.from;
              }
            }
            if (endStyles) {
              for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2) {
                if (endStyles[j$1 + 1] == nextChange) {
                  spanEndStyle += " " + endStyles[j$1];
                }
              }
            }

            if (!collapsed || collapsed.from == pos) {
              for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2) {
                buildCollapsedSpan(builder, 0, foundBookmarks[j$2]);
              }
            }
            if (collapsed && (collapsed.from || 0) == pos) {
              buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
                collapsed.marker, collapsed.from == null);
              if (collapsed.to == null) {
                return
              }
              if (collapsed.to == pos) {
                collapsed = false;
              }
            }
          }
          if (pos >= len) {
            break
          }

          var upto = Math.min(len, nextChange);
          while (true) {
            if (text) {
              var end = pos + text.length;
              if (!collapsed) {
                var tokenText = end > upto ? text.slice(0, upto - pos) : text;
                builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
                  spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title, css);
              }
              if (end >= upto) {
                text = text.slice(upto - pos);
                pos = upto;
                break
              }
              pos = end;
              spanStartStyle = "";
            }
            text = allText.slice(at, at = styles[i++]);
            style = interpretTokenStyle(styles[i++], builder.cm.options);
          }
        }
      }


      // These objects are used to represent the visible (currently drawn)
      // part of the document. A LineView may correspond to multiple
      // logical lines, if those are connected by collapsed ranges.
      function LineView(doc, line, lineN) {
        // The starting line
        this.line = line;
        // Continuing lines, if any
        this.rest = visualLineContinued(line);
        // Number of logical lines in this visual line
        this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
        this.node = this.text = null;
        this.hidden = lineIsHidden(doc, line);
      }

      // Create a range of LineView objects for the given lines.
      function buildViewArray(cm, from, to) {
        var array = [],
          nextPos;
        for (var pos = from; pos < to; pos = nextPos) {
          var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
          nextPos = pos + view.size;
          array.push(view);
        }
        return array
      }

      var operationGroup = null;

      function pushOperation(op) {
        if (operationGroup) {
          operationGroup.ops.push(op);
        } else {
          op.ownsGroup = operationGroup = {
            ops: [op],
            delayedCallbacks: []
          };
        }
      }

      function fireCallbacksForOps(group) {
        // Calls delayed callbacks and cursorActivity handlers until no
        // new ones appear
        var callbacks = group.delayedCallbacks,
          i = 0;
        do {
          for (; i < callbacks.length; i++) {
            callbacks[i].call(null);
          }
          for (var j = 0; j < group.ops.length; j++) {
            var op = group.ops[j];
            if (op.cursorActivityHandlers) {
              while (op.cursorActivityCalled < op.cursorActivityHandlers.length) {
                op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm);
              }
            }
          }
        } while (i < callbacks.length)
      }

      function finishOperation(op, endCb) {
        var group = op.ownsGroup;
        if (!group) {
          return
        }

        try {
          fireCallbacksForOps(group);
        } finally {
          operationGroup = null;
          endCb(group);
        }
      }

      var orphanDelayedCallbacks = null;

      // Often, we want to signal events at a point where we are in the
      // middle of some work, but don't want the handler to start calling
      // other methods on the editor, which might be in an inconsistent
      // state or simply not expect any other events to happen.
      // signalLater looks whether there are any handlers, and schedules
      // them to be executed when the last operation ends, or, if no
      // operation is active, when a timeout fires.
      function signalLater(emitter, type /*, values...*/ ) {
        var arr = getHandlers(emitter, type);
        if (!arr.length) {
          return
        }
        var args = Array.prototype.slice.call(arguments, 2),
          list;
        if (operationGroup) {
          list = operationGroup.delayedCallbacks;
        } else if (orphanDelayedCallbacks) {
          list = orphanDelayedCallbacks;
        } else {
          list = orphanDelayedCallbacks = [];
          setTimeout(fireOrphanDelayed, 0);
        }
        var loop = function(i) {
          list.push(function() {
            return arr[i].apply(null, args);
          });
        };

        for (var i = 0; i < arr.length; ++i)
          loop(i);
      }

      function fireOrphanDelayed() {
        var delayed = orphanDelayedCallbacks;
        orphanDelayedCallbacks = null;
        for (var i = 0; i < delayed.length; ++i) {
          delayed[i]();
        }
      }

      // When an aspect of a line changes, a string is added to
      // lineView.changes. This updates the relevant part of the line's
      // DOM structure.
      function updateLineForChanges(cm, lineView, lineN, dims) {
        for (var j = 0; j < lineView.changes.length; j++) {
          var type = lineView.changes[j];
          if (type == "text") {
            updateLineText(cm, lineView);
          } else if (type == "gutter") {
            updateLineGutter(cm, lineView, lineN, dims);
          } else if (type == "class") {
            updateLineClasses(cm, lineView);
          } else if (type == "widget") {
            updateLineWidgets(cm, lineView, dims);
          }
        }
        lineView.changes = null;
      }

      // Lines with gutter elements, widgets or a background class need to
      // be wrapped, and have the extra elements added to the wrapper div
      function ensureLineWrapped(lineView) {
        if (lineView.node == lineView.text) {
          lineView.node = elt("div", null, null, "position: relative");
          if (lineView.text.parentNode) {
            lineView.text.parentNode.replaceChild(lineView.node, lineView.text);
          }
          lineView.node.appendChild(lineView.text);
          if (ie && ie_version < 8) {
            lineView.node.style.zIndex = 2;
          }
        }
        return lineView.node
      }

      function updateLineBackground(cm, lineView) {
        var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass;
        if (cls) {
          cls += " CodeMirror-linebackground";
        }
        if (lineView.background) {
          if (cls) {
            lineView.background.className = cls;
          } else {
            lineView.background.parentNode.removeChild(lineView.background);
            lineView.background = null;
          }
        } else if (cls) {
          var wrap = ensureLineWrapped(lineView);
          lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
          cm.display.input.setUneditable(lineView.background);
        }
      }

      // Wrapper around buildLineContent which will reuse the structure
      // in display.externalMeasured when possible.
      function getLineContent(cm, lineView) {
        var ext = cm.display.externalMeasured;
        if (ext && ext.line == lineView.line) {
          cm.display.externalMeasured = null;
          lineView.measure = ext.measure;
          return ext.built
        }
        return buildLineContent(cm, lineView)
      }

      // Redraw the line's text. Interacts with the background and text
      // classes because the mode may output tokens that influence these
      // classes.
      function updateLineText(cm, lineView) {
        var cls = lineView.text.className;
        var built = getLineContent(cm, lineView);
        if (lineView.text == lineView.node) {
          lineView.node = built.pre;
        }
        lineView.text.parentNode.replaceChild(built.pre, lineView.text);
        lineView.text = built.pre;
        if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
          lineView.bgClass = built.bgClass;
          lineView.textClass = built.textClass;
          updateLineClasses(cm, lineView);
        } else if (cls) {
          lineView.text.className = cls;
        }
      }

      function updateLineClasses(cm, lineView) {
        updateLineBackground(cm, lineView);
        if (lineView.line.wrapClass) {
          ensureLineWrapped(lineView).className = lineView.line.wrapClass;
        } else if (lineView.node != lineView.text) {
          lineView.node.className = "";
        }
        var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass;
        lineView.text.className = textClass || "";
      }

      function updateLineGutter(cm, lineView, lineN, dims) {
        if (lineView.gutter) {
          lineView.node.removeChild(lineView.gutter);
          lineView.gutter = null;
        }
        if (lineView.gutterBackground) {
          lineView.node.removeChild(lineView.gutterBackground);
          lineView.gutterBackground = null;
        }
        if (lineView.line.gutterClass) {
          var wrap = ensureLineWrapped(lineView);
          lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
            ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px; width: " + (dims.gutterTotalWidth) + "px"));
          cm.display.input.setUneditable(lineView.gutterBackground);
          wrap.insertBefore(lineView.gutterBackground, lineView.text);
        }
        var markers = lineView.line.gutterMarkers;
        if (cm.options.lineNumbers || markers) {
          var wrap$1 = ensureLineWrapped(lineView);
          var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"));
          cm.display.input.setUneditable(gutterWrap);
          wrap$1.insertBefore(gutterWrap, lineView.text);
          if (lineView.line.gutterClass) {
            gutterWrap.className += " " + lineView.line.gutterClass;
          }
          if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"])) {
            lineView.lineNumber = gutterWrap.appendChild(
              elt("div", lineNumberFor(cm.options, lineN),
                "CodeMirror-linenumber CodeMirror-gutter-elt",
                ("left: " + (dims.gutterLeft["CodeMirror-linenumbers"]) + "px; width: " + (cm.display.lineNumInnerWidth) + "px")));
          }
          if (markers) {
            for (var k = 0; k < cm.options.gutters.length; ++k) {
              var id = cm.options.gutters[k],
                found = markers.hasOwnProperty(id) && markers[id];
              if (found) {
                gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt",
                  ("left: " + (dims.gutterLeft[id]) + "px; width: " + (dims.gutterWidth[id]) + "px")));
              }
            }
          }
        }
      }

      function updateLineWidgets(cm, lineView, dims) {
        if (lineView.alignable) {
          lineView.alignable = null;
        }
        for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {
          next = node.nextSibling;
          if (node.className == "CodeMirror-linewidget") {
            lineView.node.removeChild(node);
          }
        }
        insertLineWidgets(cm, lineView, dims);
      }

      // Build a line's DOM representation from scratch
      function buildLineElement(cm, lineView, lineN, dims) {
        var built = getLineContent(cm, lineView);
        lineView.text = lineView.node = built.pre;
        if (built.bgClass) {
          lineView.bgClass = built.bgClass;
        }
        if (built.textClass) {
          lineView.textClass = built.textClass;
        }

        updateLineClasses(cm, lineView);
        updateLineGutter(cm, lineView, lineN, dims);
        insertLineWidgets(cm, lineView, dims);
        return lineView.node
      }

      // A lineView may contain multiple logical lines (when merged by
      // collapsed spans). The widgets for all of them need to be drawn.
      function insertLineWidgets(cm, lineView, dims) {
        insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
        if (lineView.rest) {
          for (var i = 0; i < lineView.rest.length; i++) {
            insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false);
          }
        }
      }

      function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
        if (!line.widgets) {
          return
        }
        var wrap = ensureLineWrapped(lineView);
        for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
          var widget = ws[i],
            node = elt("div", [widget.node], "CodeMirror-linewidget");
          if (!widget.handleMouseEvents) {
            node.setAttribute("cm-ignore-events", "true");
          }
          positionLineWidget(widget, node, lineView, dims);
          cm.display.input.setUneditable(node);
          if (allowAbove && widget.above) {
            wrap.insertBefore(node, lineView.gutter || lineView.text);
          } else {
            wrap.appendChild(node);
          }
          signalLater(widget, "redraw");
        }
      }

      function positionLineWidget(widget, node, lineView, dims) {
        if (widget.noHScroll) {
          (lineView.alignable || (lineView.alignable = [])).push(node);
          var width = dims.wrapperWidth;
          node.style.left = dims.fixedPos + "px";
          if (!widget.coverGutter) {
            width -= dims.gutterTotalWidth;
            node.style.paddingLeft = dims.gutterTotalWidth + "px";
          }
          node.style.width = width + "px";
        }
        if (widget.coverGutter) {
          node.style.zIndex = 5;
          node.style.position = "relative";
          if (!widget.noHScroll) {
            node.style.marginLeft = -dims.gutterTotalWidth + "px";
          }
        }
      }

      function widgetHeight(widget) {
        if (widget.height != null) {
          return widget.height
        }
        var cm = widget.doc.cm;
        if (!cm) {
          return 0
        }
        if (!contains(document.body, widget.node)) {
          var parentStyle = "position: relative;";
          if (widget.coverGutter) {
            parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;";
          }
          if (widget.noHScroll) {
            parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;";
          }
          removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle));
        }
        return widget.height = widget.node.parentNode.offsetHeight
      }

      // Return true when the given mouse event happened in a widget
      function eventInWidget(display, e) {
        for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
          if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
            (n.parentNode == display.sizer && n != display.mover)) {
            return true
          }
        }
      }

      // POSITION MEASUREMENT

      function paddingTop(display) {
        return display.lineSpace.offsetTop
      }

      function paddingVert(display) {
        return display.mover.offsetHeight - display.lineSpace.offsetHeight
      }

      function paddingH(display) {
        if (display.cachedPaddingH) {
          return display.cachedPaddingH
        }
        var e = removeChildrenAndAdd(display.measure, elt("pre", "x"));
        var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;
        var data = {
          left: parseInt(style.paddingLeft),
          right: parseInt(style.paddingRight)
        };
        if (!isNaN(data.left) && !isNaN(data.right)) {
          display.cachedPaddingH = data;
        }
        return data
      }

      function scrollGap(cm) {
        return scrollerGap - cm.display.nativeBarWidth
      }

      function displayWidth(cm) {
        return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
      }

      function displayHeight(cm) {
        return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
      }

      // Ensure the lineView.wrapping.heights array is populated. This is
      // an array of bottom offsets for the lines that make up a drawn
      // line. When lineWrapping is on, there might be more than one
      // height.
      function ensureLineHeights(cm, lineView, rect) {
        var wrapping = cm.options.lineWrapping;
        var curWidth = wrapping && displayWidth(cm);
        if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
          var heights = lineView.measure.heights = [];
          if (wrapping) {
            lineView.measure.width = curWidth;
            var rects = lineView.text.firstChild.getClientRects();
            for (var i = 0; i < rects.length - 1; i++) {
              var cur = rects[i],
                next = rects[i + 1];
              if (Math.abs(cur.bottom - next.bottom) > 2) {
                heights.push((cur.bottom + next.top) / 2 - rect.top);
              }
            }
          }
          heights.push(rect.bottom - rect.top);
        }
      }

      // Find a line map (mapping character offsets to text nodes) and a
      // measurement cache for the given line number. (A line view might
      // contain multiple lines when collapsed ranges are present.)
      function mapFromLineView(lineView, line, lineN) {
        if (lineView.line == line) {
          return {
            map: lineView.measure.map,
            cache: lineView.measure.cache
          }
        }
        for (var i = 0; i < lineView.rest.length; i++) {
          if (lineView.rest[i] == line) {
            return {
              map: lineView.measure.maps[i],
              cache: lineView.measure.caches[i]
            }
          }
        }
        for (var i$1 = 0; i$1 < lineView.rest.length; i$1++) {
          if (lineNo(lineView.rest[i$1]) > lineN) {
            return {
              map: lineView.measure.maps[i$1],
              cache: lineView.measure.caches[i$1],
              before: true
            }
          }
        }
      }

      // Render a line into the hidden node display.externalMeasured. Used
      // when measurement is needed for a line that's not in the viewport.
      function updateExternalMeasurement(cm, line) {
        line = visualLine(line);
        var lineN = lineNo(line);
        var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
        view.lineN = lineN;
        var built = view.built = buildLineContent(cm, view);
        view.text = built.pre;
        removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
        return view
      }

      // Get a {top, bottom, left, right} box (in line-local coordinates)
      // for a given character.
      function measureChar(cm, line, ch, bias) {
        return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)
      }

      // Find a line view that corresponds to the given line number.
      function findViewForLine(cm, lineN) {
        if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo) {
          return cm.display.view[findViewIndex(cm, lineN)]
        }
        var ext = cm.display.externalMeasured;
        if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size) {
          return ext
        }
      }

      // Measurement can be split in two steps, the set-up work that
      // applies to the whole line, and the measurement of the actual
      // character. Functions like coordsChar, that need to do a lot of
      // measurements in a row, can thus ensure that the set-up work is
      // only done once.
      function prepareMeasureForLine(cm, line) {
        var lineN = lineNo(line);
        var view = findViewForLine(cm, lineN);
        if (view && !view.text) {
          view = null;
        } else if (view && view.changes) {
          updateLineForChanges(cm, view, lineN, getDimensions(cm));
          cm.curOp.forceUpdate = true;
        }
        if (!view) {
          view = updateExternalMeasurement(cm, line);
        }

        var info = mapFromLineView(view, line, lineN);
        return {
          line: line,
          view: view,
          rect: null,
          map: info.map,
          cache: info.cache,
          before: info.before,
          hasHeights: false
        }
      }

      // Given a prepared measurement object, measures the position of an
      // actual character (or fetches it from the cache).
      function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
        if (prepared.before) {
          ch = -1;
        }
        var key = ch + (bias || ""),
          found;
        if (prepared.cache.hasOwnProperty(key)) {
          found = prepared.cache[key];
        } else {
          if (!prepared.rect) {
            prepared.rect = prepared.view.text.getBoundingClientRect();
          }
          if (!prepared.hasHeights) {
            ensureLineHeights(cm, prepared.view, prepared.rect);
            prepared.hasHeights = true;
          }
          found = measureCharInner(cm, prepared, ch, bias);
          if (!found.bogus) {
            prepared.cache[key] = found;
          }
        }
        return {
          left: found.left,
          right: found.right,
          top: varHeight ? found.rtop : found.top,
          bottom: varHeight ? found.rbottom : found.bottom
        }
      }

      var nullRect = {
        left: 0,
        right: 0,
        top: 0,
        bottom: 0
      };

      function nodeAndOffsetInLineMap(map$$1, ch, bias) {
        var node, start, end, collapse, mStart, mEnd;
        // First, search the line map for the text node corresponding to,
        // or closest to, the target character.
        for (var i = 0; i < map$$1.length; i += 3) {
          mStart = map$$1[i];
          mEnd = map$$1[i + 1];
          if (ch < mStart) {
            start = 0;
            end = 1;
            collapse = "left";
          } else if (ch < mEnd) {
            start = ch - mStart;
            end = start + 1;
          } else if (i == map$$1.length - 3 || ch == mEnd && map$$1[i + 3] > ch) {
            end = mEnd - mStart;
            start = end - 1;
            if (ch >= mEnd) {
              collapse = "right";
            }
          }
          if (start != null) {
            node = map$$1[i + 2];
            if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right")) {
              collapse = bias;
            }
            if (bias == "left" && start == 0) {
              while (i && map$$1[i - 2] == map$$1[i - 3] && map$$1[i - 1].insertLeft) {
                node = map$$1[(i -= 3) + 2];
                collapse = "left";
              }
            }
            if (bias == "right" && start == mEnd - mStart) {
              while (i < map$$1.length - 3 && map$$1[i + 3] == map$$1[i + 4] && !map$$1[i + 5].insertLeft) {
                node = map$$1[(i += 3) + 2];
                collapse = "right";
              }
            }
            break
          }
        }
        return {
          node: node,
          start: start,
          end: end,
          collapse: collapse,
          coverStart: mStart,
          coverEnd: mEnd
        }
      }

      function getUsefulRect(rects, bias) {
        var rect = nullRect;
        if (bias == "left") {
          for (var i = 0; i < rects.length; i++) {
            if ((rect = rects[i]).left != rect.right) {
              break
            }
          }
        } else {
          for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {
            if ((rect = rects[i$1]).left != rect.right) {
              break
            }
          }
        }
        return rect
      }

      function measureCharInner(cm, prepared, ch, bias) {
        var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
        var node = place.node,
          start = place.start,
          end = place.end,
          collapse = place.collapse;

        var rect;
        if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
          for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned
            while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) {
              --start;
            }
            while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) {
              ++end;
            }
            if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart) {
              rect = node.parentNode.getBoundingClientRect();
            } else {
              rect = getUsefulRect(range(node, start, end).getClientRects(), bias);
            }
            if (rect.left || rect.right || start == 0) {
              break
            }
            end = start;
            start = start - 1;
            collapse = "right";
          }
          if (ie && ie_version < 11) {
            rect = maybeUpdateRectForZooming(cm.display.measure, rect);
          }
        } else { // If it is a widget, simply get the box for the whole widget.
          if (start > 0) {
            collapse = bias = "right";
          }
          var rects;
          if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1) {
            rect = rects[bias == "right" ? rects.length - 1 : 0];
          } else {
            rect = node.getBoundingClientRect();
          }
        }
        if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
          var rSpan = node.parentNode.getClientRects()[0];
          if (rSpan) {
            rect = {
              left: rSpan.left,
              right: rSpan.left + charWidth(cm.display),
              top: rSpan.top,
              bottom: rSpan.bottom
            };
          } else {
            rect = nullRect;
          }
        }

        var rtop = rect.top - prepared.rect.top,
          rbot = rect.bottom - prepared.rect.top;
        var mid = (rtop + rbot) / 2;
        var heights = prepared.view.measure.heights;
        var i = 0;
        for (; i < heights.length - 1; i++) {
          if (mid < heights[i]) {
            break
          }
        }
        var top = i ? heights[i - 1] : 0,
          bot = heights[i];
        var result = {
          left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
          right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
          top: top,
          bottom: bot
        };
        if (!rect.left && !rect.right) {
          result.bogus = true;
        }
        if (!cm.options.singleCursorHeightPerLine) {
          result.rtop = rtop;
          result.rbottom = rbot;
        }

        return result
      }

      // Work around problem with bounding client rects on ranges being
      // returned incorrectly when zoomed on IE10 and below.
      function maybeUpdateRectForZooming(measure, rect) {
        if (!window.screen || screen.logicalXDPI == null ||
          screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure)) {
          return rect
        }
        var scaleX = screen.logicalXDPI / screen.deviceXDPI;
        var scaleY = screen.logicalYDPI / screen.deviceYDPI;
        return {
          left: rect.left * scaleX,
          right: rect.right * scaleX,
          top: rect.top * scaleY,
          bottom: rect.bottom * scaleY
        }
      }

      function clearLineMeasurementCacheFor(lineView) {
        if (lineView.measure) {
          lineView.measure.cache = {};
          lineView.measure.heights = null;
          if (lineView.rest) {
            for (var i = 0; i < lineView.rest.length; i++) {
              lineView.measure.caches[i] = {};
            }
          }
        }
      }

      function clearLineMeasurementCache(cm) {
        cm.display.externalMeasure = null;
        removeChildren(cm.display.lineMeasure);
        for (var i = 0; i < cm.display.view.length; i++) {
          clearLineMeasurementCacheFor(cm.display.view[i]);
        }
      }

      function clearCaches(cm) {
        clearLineMeasurementCache(cm);
        cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;
        if (!cm.options.lineWrapping) {
          cm.display.maxLineChanged = true;
        }
        cm.display.lineNumChars = null;
      }

      function pageScrollX() {
        // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
        // which causes page_Offset and bounding client rects to use
        // different reference viewports and invalidate our calculations.
        if (chrome && android) {
          return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft))
        }
        return window.pageXOffset || (document.documentElement || document.body).scrollLeft
      }

      function pageScrollY() {
        if (chrome && android) {
          return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop))
        }
        return window.pageYOffset || (document.documentElement || document.body).scrollTop
      }

      function widgetTopHeight(lineObj) {
        var height = 0;
        if (lineObj.widgets) {
          for (var i = 0; i < lineObj.widgets.length; ++i) {
            if (lineObj.widgets[i].above) {
              height += widgetHeight(lineObj.widgets[i]);
            }
          }
        }
        return height
      }

      // Converts a {top, bottom, left, right} box from line-local
      // coordinates into another coordinate system. Context may be one of
      // "line", "div" (display.lineDiv), "local"./null (editor), "window",
      // or "page".
      function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
        if (!includeWidgets) {
          var height = widgetTopHeight(lineObj);
          rect.top += height;
          rect.bottom += height;
        }
        if (context == "line") {
          return rect
        }
        if (!context) {
          context = "local";
        }
        var yOff = heightAtLine(lineObj);
        if (context == "local") {
          yOff += paddingTop(cm.display);
        } else {
          yOff -= cm.display.viewOffset;
        }
        if (context == "page" || context == "window") {
          var lOff = cm.display.lineSpace.getBoundingClientRect();
          yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
          var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
          rect.left += xOff;
          rect.right += xOff;
        }
        rect.top += yOff;
        rect.bottom += yOff;
        return rect
      }

      // Coverts a box from "div" coords to another coordinate system.
      // Context may be "window", "page", "div", or "local"./null.
      function fromCoordSystem(cm, coords, context) {
        if (context == "div") {
          return coords
        }
        var left = coords.left,
          top = coords.top;
        // First move into "page" coordinate system
        if (context == "page") {
          left -= pageScrollX();
          top -= pageScrollY();
        } else if (context == "local" || !context) {
          var localBox = cm.display.sizer.getBoundingClientRect();
          left += localBox.left;
          top += localBox.top;
        }

        var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
        return {
          left: left - lineSpaceBox.left,
          top: top - lineSpaceBox.top
        }
      }

      function charCoords(cm, pos, context, lineObj, bias) {
        if (!lineObj) {
          lineObj = getLine(cm.doc, pos.line);
        }
        return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)
      }

      // Returns a box for a given cursor position, which may have an
      // 'other' property containing the position of the secondary cursor
      // on a bidi boundary.
      // A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
      // and after `char - 1` in writing order of `char - 1`
      // A cursor Pos(line, char, "after") is on the same visual line as `char`
      // and before `char` in writing order of `char`
      // Examples (upper-case letters are RTL, lower-case are LTR):
      //     Pos(0, 1, ...)
      //     before   after
      // ab     a|b     a|b
      // aB     a|B     aB|
      // Ab     |Ab     A|b
      // AB     B|A     B|A
      // Every position after the last character on a line is considered to stick
      // to the last character on the line.
      function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
        lineObj = lineObj || getLine(cm.doc, pos.line);
        if (!preparedMeasure) {
          preparedMeasure = prepareMeasureForLine(cm, lineObj);
        }

        function get(ch, right) {
          var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight);
          if (right) {
            m.left = m.right;
          } else {
            m.right = m.left;
          }
          return intoCoordSystem(cm, lineObj, m, context)
        }
        var order = getOrder(lineObj, cm.doc.direction),
          ch = pos.ch,
          sticky = pos.sticky;
        if (ch >= lineObj.text.length) {
          ch = lineObj.text.length;
          sticky = "before";
        } else if (ch <= 0) {
          ch = 0;
          sticky = "after";
        }
        if (!order) {
          return get(sticky == "before" ? ch - 1 : ch, sticky == "before")
        }

        function getBidi(ch, partPos, invert) {
          var part = order[partPos],
            right = part.level == 1;
          return get(invert ? ch - 1 : ch, right != invert)
        }
        var partPos = getBidiPartAt(order, ch, sticky);
        var other = bidiOther;
        var val = getBidi(ch, partPos, sticky == "before");
        if (other != null) {
          val.other = getBidi(ch, other, sticky != "before");
        }
        return val
      }

      // Used to cheaply estimate the coordinates for a position. Used for
      // intermediate scroll updates.
      function estimateCoords(cm, pos) {
        var left = 0;
        pos = clipPos(cm.doc, pos);
        if (!cm.options.lineWrapping) {
          left = charWidth(cm.display) * pos.ch;
        }
        var lineObj = getLine(cm.doc, pos.line);
        var top = heightAtLine(lineObj) + paddingTop(cm.display);
        return {
          left: left,
          right: left,
          top: top,
          bottom: top + lineObj.height
        }
      }

      // Positions returned by coordsChar contain some extra information.
      // xRel is the relative x position of the input coordinates compared
      // to the found position (so xRel > 0 means the coordinates are to
      // the right of the character position, for example). When outside
      // is true, that means the coordinates lie outside the line's
      // vertical range.
      function PosWithInfo(line, ch, sticky, outside, xRel) {
        var pos = Pos(line, ch, sticky);
        pos.xRel = xRel;
        if (outside) {
          pos.outside = true;
        }
        return pos
      }

      // Compute the character position closest to the given coordinates.
      // Input must be lineSpace-local ("div" coordinate system).
      function coordsChar(cm, x, y) {
        var doc = cm.doc;
        y += cm.display.viewOffset;
        if (y < 0) {
          return PosWithInfo(doc.first, 0, null, true, -1)
        }
        var lineN = lineAtHeight(doc, y),
          last = doc.first + doc.size - 1;
        if (lineN > last) {
          return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, true, 1)
        }
        if (x < 0) {
          x = 0;
        }

        var lineObj = getLine(doc, lineN);
        for (;;) {
          var found = coordsCharInner(cm, lineObj, lineN, x, y);
          var merged = collapsedSpanAtEnd(lineObj);
          var mergedPos = merged && merged.find(0, true);
          if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0)) {
            lineN = lineNo(lineObj = mergedPos.to.line);
          } else {
            return found
          }
        }
      }

      function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
        y -= widgetTopHeight(lineObj);
        var end = lineObj.text.length;
        var begin = findFirst(function(ch) {
          return measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y;
        }, end, 0);
        end = findFirst(function(ch) {
          return measureCharPrepared(cm, preparedMeasure, ch).top > y;
        }, begin, end);
        return {
          begin: begin,
          end: end
        }
      }

      function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
        if (!preparedMeasure) {
          preparedMeasure = prepareMeasureForLine(cm, lineObj);
        }
        var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top;
        return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)
      }

      // Returns true if the given side of a box is after the given
      // coordinates, in top-to-bottom, left-to-right order.
      function boxIsAfter(box, x, y, left) {
        return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x
      }

      function coordsCharInner(cm, lineObj, lineNo$$1, x, y) {
        // Move y into line-local coordinate space
        y -= heightAtLine(lineObj);
        var preparedMeasure = prepareMeasureForLine(cm, lineObj);
        // When directly calling `measureCharPrepared`, we have to adjust
        // for the widgets at this line.
        var widgetHeight$$1 = widgetTopHeight(lineObj);
        var begin = 0,
          end = lineObj.text.length,
          ltr = true;

        var order = getOrder(lineObj, cm.doc.direction);
        // If the line isn't plain left-to-right text, first figure out
        // which bidi section the coordinates fall into.
        if (order) {
          var part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)
            (cm, lineObj, lineNo$$1, preparedMeasure, order, x, y);
          ltr = part.level != 1;
          // The awkward -1 offsets are needed because findFirst (called
          // on these below) will treat its first bound as inclusive,
          // second as exclusive, but we want to actually address the
          // characters in the part's range
          begin = ltr ? part.from : part.to - 1;
          end = ltr ? part.to : part.from - 1;
        }

        // A binary search to find the first character whose bounding box
        // starts after the coordinates. If we run across any whose box wrap
        // the coordinates, store that.
        var chAround = null,
          boxAround = null;
        var ch = findFirst(function(ch) {
          var box = measureCharPrepared(cm, preparedMeasure, ch);
          box.top += widgetHeight$$1;
          box.bottom += widgetHeight$$1;
          if (!boxIsAfter(box, x, y, false)) {
            return false
          }
          if (box.top <= y && box.left <= x) {
            chAround = ch;
            boxAround = box;
          }
          return true
        }, begin, end);

        var baseX, sticky, outside = false;
        // If a box around the coordinates was found, use that
        if (boxAround) {
          // Distinguish coordinates nearer to the left or right side of the box
          var atLeft = x - boxAround.left < boxAround.right - x,
            atStart = atLeft == ltr;
          ch = chAround + (atStart ? 0 : 1);
          sticky = atStart ? "after" : "before";
          baseX = atLeft ? boxAround.left : boxAround.right;
        } else {
          // (Adjust for extended bound, if necessary.)
          if (!ltr && (ch == end || ch == begin)) {
            ch++;
          }
          // To determine which side to associate with, get the box to the
          // left of the character and compare it's vertical position to the
          // coordinates
          sticky = ch == 0 ? "after" : ch == lineObj.text.length ? "before" :
            (measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight$$1 <= y) == ltr ?
            "after" : "before";
          // Now get accurate coordinates for this place, in order to get a
          // base X position
          var coords = cursorCoords(cm, Pos(lineNo$$1, ch, sticky), "line", lineObj, preparedMeasure);
          baseX = coords.left;
          outside = y < coords.top || y >= coords.bottom;
        }

        ch = skipExtendingChars(lineObj.text, ch, 1);
        return PosWithInfo(lineNo$$1, ch, sticky, outside, x - baseX)
      }

      function coordsBidiPart(cm, lineObj, lineNo$$1, preparedMeasure, order, x, y) {
        // Bidi parts are sorted left-to-right, and in a non-line-wrapping
        // situation, we can take this ordering to correspond to the visual
        // ordering. This finds the first part whose end is after the given
        // coordinates.
        var index = findFirst(function(i) {
          var part = order[i],
            ltr = part.level != 1;
          return boxIsAfter(cursorCoords(cm, Pos(lineNo$$1, ltr ? part.to : part.from, ltr ? "before" : "after"),
            "line", lineObj, preparedMeasure), x, y, true)
        }, 0, order.length - 1);
        var part = order[index];
        // If this isn't the first part, the part's start is also after
        // the coordinates, and the coordinates aren't on the same line as
        // that start, move one part back.
        if (index > 0) {
          var ltr = part.level != 1;
          var start = cursorCoords(cm, Pos(lineNo$$1, ltr ? part.from : part.to, ltr ? "after" : "before"),
            "line", lineObj, preparedMeasure);
          if (boxIsAfter(start, x, y, true) && start.top > y) {
            part = order[index - 1];
          }
        }
        return part
      }

      function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {
        // In a wrapped line, rtl text on wrapping boundaries can do things
        // that don't correspond to the ordering in our `order` array at
        // all, so a binary search doesn't work, and we want to return a
        // part that only spans one line so that the binary search in
        // coordsCharInner is safe. As such, we first find the extent of the
        // wrapped line, and then do a flat search in which we discard any
        // spans that aren't on the line.
        var ref = wrappedLineExtent(cm, lineObj, preparedMeasure, y);
        var begin = ref.begin;
        var end = ref.end;
        if (/\s/.test(lineObj.text.charAt(end - 1))) {
          end--;
        }
        var part = null,
          closestDist = null;
        for (var i = 0; i < order.length; i++) {
          var p = order[i];
          if (p.from >= end || p.to <= begin) {
            continue
          }
          var ltr = p.level != 1;
          var endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right;
          // Weigh against spans ending before this, so that they are only
          // picked if nothing ends after
          var dist = endX < x ? x - endX + 1e9 : endX - x;
          if (!part || closestDist > dist) {
            part = p;
            closestDist = dist;
          }
        }
        if (!part) {
          part = order[order.length - 1];
        }
        // Clip the part to the wrapped line.
        if (part.from < begin) {
          part = {
            from: begin,
            to: part.to,
            level: part.level
          };
        }
        if (part.to > end) {
          part = {
            from: part.from,
            to: end,
            level: part.level
          };
        }
        return part
      }

      var measureText;
      // Compute the default text height.
      function textHeight(display) {
        if (display.cachedTextHeight != null) {
          return display.cachedTextHeight
        }
        if (measureText == null) {
          measureText = elt("pre");
          // Measure a bunch of lines, for browsers that compute
          // fractional heights.
          for (var i = 0; i < 49; ++i) {
            measureText.appendChild(document.createTextNode("x"));
            measureText.appendChild(elt("br"));
          }
          measureText.appendChild(document.createTextNode("x"));
        }
        removeChildrenAndAdd(display.measure, measureText);
        var height = measureText.offsetHeight / 50;
        if (height > 3) {
          display.cachedTextHeight = height;
        }
        removeChildren(display.measure);
        return height || 1
      }

      // Compute the default character width.
      function charWidth(display) {
        if (display.cachedCharWidth != null) {
          return display.cachedCharWidth
        }
        var anchor = elt("span", "xxxxxxxxxx");
        var pre = elt("pre", [anchor]);
        removeChildrenAndAdd(display.measure, pre);
        var rect = anchor.getBoundingClientRect(),
          width = (rect.right - rect.left) / 10;
        if (width > 2) {
          display.cachedCharWidth = width;
        }
        return width || 10
      }

      // Do a bulk-read of the DOM positions and sizes needed to draw the
      // view, so that we don't interleave reading and writing to the DOM.
      function getDimensions(cm) {
        var d = cm.display,
          left = {},
          width = {};
        var gutterLeft = d.gutters.clientLeft;
        for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
          left[cm.options.gutters[i]] = n.offsetLeft + n.clientLeft + gutterLeft;
          width[cm.options.gutters[i]] = n.clientWidth;
        }
        return {
          fixedPos: compensateForHScroll(d),
          gutterTotalWidth: d.gutters.offsetWidth,
          gutterLeft: left,
          gutterWidth: width,
          wrapperWidth: d.wrapper.clientWidth
        }
      }

      // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
      // but using getBoundingClientRect to get a sub-pixel-accurate
      // result.
      function compensateForHScroll(display) {
        return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left
      }

      // Returns a function that estimates the height of a line, to use as
      // first approximation until the line becomes visible (and is thus
      // properly measurable).
      function estimateHeight(cm) {
        var th = textHeight(cm.display),
          wrapping = cm.options.lineWrapping;
        var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
        return function(line) {
          if (lineIsHidden(cm.doc, line)) {
            return 0
          }

          var widgetsHeight = 0;
          if (line.widgets) {
            for (var i = 0; i < line.widgets.length; i++) {
              if (line.widgets[i].height) {
                widgetsHeight += line.widgets[i].height;
              }
            }
          }

          if (wrapping) {
            return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th
          } else {
            return widgetsHeight + th
          }
        }
      }

      function estimateLineHeights(cm) {
        var doc = cm.doc,
          est = estimateHeight(cm);
        doc.iter(function(line) {
          var estHeight = est(line);
          if (estHeight != line.height) {
            updateLineHeight(line, estHeight);
          }
        });
      }

      // Given a mouse event, find the corresponding position. If liberal
      // is false, it checks whether a gutter or scrollbar was clicked,
      // and returns null if it was. forRect is used by rectangular
      // selections, and tries to estimate a character position even for
      // coordinates beyond the right of the text.
      function posFromMouse(cm, e, liberal, forRect) {
        var display = cm.display;
        if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") {
          return null
        }

        var x, y, space = display.lineSpace.getBoundingClientRect();
        // Fails unpredictably on IE[67] when mouse is dragged around quickly.
        try {
          x = e.clientX - space.left;
          y = e.clientY - space.top;
        } catch (e) {
          return null
        }
        var coords = coordsChar(cm, x, y),
          line;
        if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
          var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
          coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
        }
        return coords
      }

      // Find the view element corresponding to a given line. Return null
      // when the line isn't visible.
      function findViewIndex(cm, n) {
        if (n >= cm.display.viewTo) {
          return null
        }
        n -= cm.display.viewFrom;
        if (n < 0) {
          return null
        }
        var view = cm.display.view;
        for (var i = 0; i < view.length; i++) {
          n -= view[i].size;
          if (n < 0) {
            return i
          }
        }
      }

      function updateSelection(cm) {
        cm.display.input.showSelection(cm.display.input.prepareSelection());
      }

      function prepareSelection(cm, primary) {
        if (primary === void 0) primary = true;

        var doc = cm.doc,
          result = {};
        var curFragment = result.cursors = document.createDocumentFragment();
        var selFragment = result.selection = document.createDocumentFragment();

        for (var i = 0; i < doc.sel.ranges.length; i++) {
          if (!primary && i == doc.sel.primIndex) {
            continue
          }
          var range$$1 = doc.sel.ranges[i];
          if (range$$1.from().line >= cm.display.viewTo || range$$1.to().line < cm.display.viewFrom) {
            continue
          }
          var collapsed = range$$1.empty();
          if (collapsed || cm.options.showCursorWhenSelecting) {
            drawSelectionCursor(cm, range$$1.head, curFragment);
          }
          if (!collapsed) {
            drawSelectionRange(cm, range$$1, selFragment);
          }
        }
        return result
      }

      // Draws a cursor for the given range
      function drawSelectionCursor(cm, head, output) {
        var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine);

        var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
        cursor.style.left = pos.left + "px";
        cursor.style.top = pos.top + "px";
        cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";

        if (pos.other) {
          // Secondary cursor, shown when on a 'jump' in bi-directional text
          var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
          otherCursor.style.display = "";
          otherCursor.style.left = pos.other.left + "px";
          otherCursor.style.top = pos.other.top + "px";
          otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
        }
      }

      function cmpCoords(a, b) {
        return a.top - b.top || a.left - b.left
      }

      // Draws the given range as a highlighted selection
      function drawSelectionRange(cm, range$$1, output) {
        var display = cm.display,
          doc = cm.doc;
        var fragment = document.createDocumentFragment();
        var padding = paddingH(cm.display),
          leftSide = padding.left;
        var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;
        var docLTR = doc.direction == "ltr";

        function add(left, top, width, bottom) {
          if (top < 0) {
            top = 0;
          }
          top = Math.round(top);
          bottom = Math.round(bottom);
          fragment.appendChild(elt("div", null, "CodeMirror-selected", ("position: absolute; left: " + left + "px;\n                             top: " + top + "px; width: " + (width == null ? rightSide - left : width) + "px;\n                             height: " + (bottom - top) + "px")));
        }

        function drawForLine(line, fromArg, toArg) {
          var lineObj = getLine(doc, line);
          var lineLen = lineObj.text.length;
          var start, end;

          function coords(ch, bias) {
            return charCoords(cm, Pos(line, ch), "div", lineObj, bias)
          }

          function wrapX(pos, dir, side) {
            var extent = wrappedLineExtentChar(cm, lineObj, null, pos);
            var prop = (dir == "ltr") == (side == "after") ? "left" : "right";
            var ch = side == "after" ? extent.begin : extent.end - (/\s/.test(lineObj.text.charAt(extent.end - 1)) ? 2 : 1);
            return coords(ch, prop)[prop]
          }

          var order = getOrder(lineObj, doc.direction);
          iterateBidiSections(order, fromArg || 0, toArg == null ? lineLen : toArg, function(from, to, dir, i) {
            var ltr = dir == "ltr";
            var fromPos = coords(from, ltr ? "left" : "right");
            var toPos = coords(to - 1, ltr ? "right" : "left");

            var openStart = fromArg == null && from == 0,
              openEnd = toArg == null && to == lineLen;
            var first = i == 0,
              last = !order || i == order.length - 1;
            if (toPos.top - fromPos.top <= 3) { // Single line
              var openLeft = (docLTR ? openStart : openEnd) && first;
              var openRight = (docLTR ? openEnd : openStart) && last;
              var left = openLeft ? leftSide : (ltr ? fromPos : toPos).left;
              var right = openRight ? rightSide : (ltr ? toPos : fromPos).right;
              add(left, fromPos.top, right - left, fromPos.bottom);
            } else { // Multiple lines
              var topLeft, topRight, botLeft, botRight;
              if (ltr) {
                topLeft = docLTR && openStart && first ? leftSide : fromPos.left;
                topRight = docLTR ? rightSide : wrapX(from, dir, "before");
                botLeft = docLTR ? leftSide : wrapX(to, dir, "after");
                botRight = docLTR && openEnd && last ? rightSide : toPos.right;
              } else {
                topLeft = !docLTR ? leftSide : wrapX(from, dir, "before");
                topRight = !docLTR && openStart && first ? rightSide : fromPos.right;
                botLeft = !docLTR && openEnd && last ? leftSide : toPos.left;
                botRight = !docLTR ? rightSide : wrapX(to, dir, "after");
              }
              add(topLeft, fromPos.top, topRight - topLeft, fromPos.bottom);
              if (fromPos.bottom < toPos.top) {
                add(leftSide, fromPos.bottom, null, toPos.top);
              }
              add(botLeft, toPos.top, botRight - botLeft, toPos.bottom);
            }

            if (!start || cmpCoords(fromPos, start) < 0) {
              start = fromPos;
            }
            if (cmpCoords(toPos, start) < 0) {
              start = toPos;
            }
            if (!end || cmpCoords(fromPos, end) < 0) {
              end = fromPos;
            }
            if (cmpCoords(toPos, end) < 0) {
              end = toPos;
            }
          });
          return {
            start: start,
            end: end
          }
        }

        var sFrom = range$$1.from(),
          sTo = range$$1.to();
        if (sFrom.line == sTo.line) {
          drawForLine(sFrom.line, sFrom.ch, sTo.ch);
        } else {
          var fromLine = getLine(doc, sFrom.line),
            toLine = getLine(doc, sTo.line);
          var singleVLine = visualLine(fromLine) == visualLine(toLine);
          var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;
          var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;
          if (singleVLine) {
            if (leftEnd.top < rightStart.top - 2) {
              add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
              add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
            } else {
              add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
            }
          }
          if (leftEnd.bottom < rightStart.top) {
            add(leftSide, leftEnd.bottom, null, rightStart.top);
          }
        }

        output.appendChild(fragment);
      }

      // Cursor-blinking
      function restartBlink(cm) {
        if (!cm.state.focused) {
          return
        }
        var display = cm.display;
        clearInterval(display.blinker);
        var on = true;
        display.cursorDiv.style.visibility = "";
        if (cm.options.cursorBlinkRate > 0) {
          display.blinker = setInterval(function() {
              return display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden";
            },
            cm.options.cursorBlinkRate);
        } else if (cm.options.cursorBlinkRate < 0) {
          display.cursorDiv.style.visibility = "hidden";
        }
      }

      function ensureFocus(cm) {
        if (!cm.state.focused) {
          cm.display.input.focus();
          onFocus(cm);
        }
      }

      function delayBlurEvent(cm) {
        cm.state.delayingBlurEvent = true;
        setTimeout(function() {
          if (cm.state.delayingBlurEvent) {
            cm.state.delayingBlurEvent = false;
            onBlur(cm);
          }
        }, 100);
      }

      function onFocus(cm, e) {
        if (cm.state.delayingBlurEvent) {
          cm.state.delayingBlurEvent = false;
        }

        if (cm.options.readOnly == "nocursor") {
          return
        }
        if (!cm.state.focused) {
          signal(cm, "focus", cm, e);
          cm.state.focused = true;
          addClass(cm.display.wrapper, "CodeMirror-focused");
          // This test prevents this from firing when a context
          // menu is closed (since the input reset would kill the
          // select-all detection hack)
          if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
            cm.display.input.reset();
            if (webkit) {
              setTimeout(function() {
                return cm.display.input.reset(true);
              }, 20);
            } // Issue #1730
          }
          cm.display.input.receivedFocus();
        }
        restartBlink(cm);
      }

      function onBlur(cm, e) {
        if (cm.state.delayingBlurEvent) {
          return
        }

        if (cm.state.focused) {
          signal(cm, "blur", cm, e);
          cm.state.focused = false;
          rmClass(cm.display.wrapper, "CodeMirror-focused");
        }
        clearInterval(cm.display.blinker);
        setTimeout(function() {
          if (!cm.state.focused) {
            cm.display.shift = false;
          }
        }, 150);
      }

      // Read the actual heights of the rendered lines, and update their
      // stored heights to match.
      function updateHeightsInViewport(cm) {
        var display = cm.display;
        var prevBottom = display.lineDiv.offsetTop;
        for (var i = 0; i < display.view.length; i++) {
          var cur = display.view[i],
            height = (void 0);
          if (cur.hidden) {
            continue
          }
          if (ie && ie_version < 8) {
            var bot = cur.node.offsetTop + cur.node.offsetHeight;
            height = bot - prevBottom;
            prevBottom = bot;
          } else {
            var box = cur.node.getBoundingClientRect();
            height = box.bottom - box.top;
          }
          var diff = cur.line.height - height;
          if (height < 2) {
            height = textHeight(display);
          }
          if (diff > .005 || diff < -.005) {
            updateLineHeight(cur.line, height);
            updateWidgetHeight(cur.line);
            if (cur.rest) {
              for (var j = 0; j < cur.rest.length; j++) {
                updateWidgetHeight(cur.rest[j]);
              }
            }
          }
        }
      }

      // Read and store the height of line widgets associated with the
      // given line.
      function updateWidgetHeight(line) {
        if (line.widgets) {
          for (var i = 0; i < line.widgets.length; ++i) {
            var w = line.widgets[i],
              parent = w.node.parentNode;
            if (parent) {
              w.height = parent.offsetHeight;
            }
          }
        }
      }

      // Compute the lines that are visible in a given viewport (defaults
      // the the current scroll position). viewport may contain top,
      // height, and ensure (see op.scrollToPos) properties.
      function visibleLines(display, doc, viewport) {
        var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;
        top = Math.floor(top - paddingTop(display));
        var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;

        var from = lineAtHeight(doc, top),
          to = lineAtHeight(doc, bottom);
        // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
        // forces those lines into the viewport (if possible).
        if (viewport && viewport.ensure) {
          var ensureFrom = viewport.ensure.from.line,
            ensureTo = viewport.ensure.to.line;
          if (ensureFrom < from) {
            from = ensureFrom;
            to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);
          } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
            from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);
            to = ensureTo;
          }
        }
        return {
          from: from,
          to: Math.max(to, from + 1)
        }
      }

      // Re-align line numbers and gutter marks to compensate for
      // horizontal scrolling.
      function alignHorizontally(cm) {
        var display = cm.display,
          view = display.view;
        if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) {
          return
        }
        var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
        var gutterW = display.gutters.offsetWidth,
          left = comp + "px";
        for (var i = 0; i < view.length; i++) {
          if (!view[i].hidden) {
            if (cm.options.fixedGutter) {
              if (view[i].gutter) {
                view[i].gutter.style.left = left;
              }
              if (view[i].gutterBackground) {
                view[i].gutterBackground.style.left = left;
              }
            }
            var align = view[i].alignable;
            if (align) {
              for (var j = 0; j < align.length; j++) {
                align[j].style.left = left;
              }
            }
          }
        }
        if (cm.options.fixedGutter) {
          display.gutters.style.left = (comp + gutterW) + "px";
        }
      }

      // Used to ensure that the line number gutter is still the right
      // size for the current document size. Returns true when an update
      // is needed.
      function maybeUpdateLineNumberWidth(cm) {
        if (!cm.options.lineNumbers) {
          return false
        }
        var doc = cm.doc,
          last = lineNumberFor(cm.options, doc.first + doc.size - 1),
          display = cm.display;
        if (last.length != display.lineNumChars) {
          var test = display.measure.appendChild(elt("div", [elt("div", last)],
            "CodeMirror-linenumber CodeMirror-gutter-elt"));
          var innerW = test.firstChild.offsetWidth,
            padding = test.offsetWidth - innerW;
          display.lineGutter.style.width = "";
          display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;
          display.lineNumWidth = display.lineNumInnerWidth + padding;
          display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
          display.lineGutter.style.width = display.lineNumWidth + "px";
          updateGutterSpace(cm);
          return true
        }
        return false
      }

      // SCROLLING THINGS INTO VIEW

      // If an editor sits on the top or bottom of the window, partially
      // scrolled out of view, this ensures that the cursor is visible.
      function maybeScrollWindow(cm, rect) {
        if (signalDOMEvent(cm, "scrollCursorIntoView")) {
          return
        }

        var display = cm.display,
          box = display.sizer.getBoundingClientRect(),
          doScroll = null;
        if (rect.top + box.top < 0) {
          doScroll = true;
        } else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) {
          doScroll = false;
        }
        if (doScroll != null && !phantom) {
          var scrollNode = elt("div", "\u200b", null, ("position: absolute;\n                         top: " + (rect.top - display.viewOffset - paddingTop(cm.display)) + "px;\n                         height: " + (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) + "px;\n                         left: " + (rect.left) + "px; width: " + (Math.max(2, rect.right - rect.left)) + "px;"));
          cm.display.lineSpace.appendChild(scrollNode);
          scrollNode.scrollIntoView(doScroll);
          cm.display.lineSpace.removeChild(scrollNode);
        }
      }

      // Scroll a given position into view (immediately), verifying that
      // it actually became visible (as line heights are accurately
      // measured, the position of something may 'drift' during drawing).
      function scrollPosIntoView(cm, pos, end, margin) {
        if (margin == null) {
          margin = 0;
        }
        var rect;
        if (!cm.options.lineWrapping && pos == end) {
          // Set pos and end to the cursor positions around the character pos sticks to
          // If pos.sticky == "before", that is around pos.ch - 1, otherwise around pos.ch
          // If pos == Pos(_, 0, "before"), pos and end are unchanged
          pos = pos.ch ? Pos(pos.line, pos.sticky == "before" ? pos.ch - 1 : pos.ch, "after") : pos;
          end = pos.sticky == "before" ? Pos(pos.line, pos.ch + 1, "before") : pos;
        }
        for (var limit = 0; limit < 5; limit++) {
          var changed = false;
          var coords = cursorCoords(cm, pos);
          var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
          rect = {
            left: Math.min(coords.left, endCoords.left),
            top: Math.min(coords.top, endCoords.top) - margin,
            right: Math.max(coords.left, endCoords.left),
            bottom: Math.max(coords.bottom, endCoords.bottom) + margin
          };
          var scrollPos = calculateScrollPos(cm, rect);
          var startTop = cm.doc.scrollTop,
            startLeft = cm.doc.scrollLeft;
          if (scrollPos.scrollTop != null) {
            updateScrollTop(cm, scrollPos.scrollTop);
            if (Math.abs(cm.doc.scrollTop - startTop) > 1) {
              changed = true;
            }
          }
          if (scrollPos.scrollLeft != null) {
            setScrollLeft(cm, scrollPos.scrollLeft);
            if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) {
              changed = true;
            }
          }
          if (!changed) {
            break
          }
        }
        return rect
      }

      // Scroll a given set of coordinates into view (immediately).
      function scrollIntoView(cm, rect) {
        var scrollPos = calculateScrollPos(cm, rect);
        if (scrollPos.scrollTop != null) {
          updateScrollTop(cm, scrollPos.scrollTop);
        }
        if (scrollPos.scrollLeft != null) {
          setScrollLeft(cm, scrollPos.scrollLeft);
        }
      }

      // Calculate a new scroll position needed to scroll the given
      // rectangle into view. Returns an object with scrollTop and
      // scrollLeft properties. When these are undefined, the
      // vertical/horizontal position does not need to be adjusted.
      function calculateScrollPos(cm, rect) {
        var display = cm.display,
          snapMargin = textHeight(cm.display);
        if (rect.top < 0) {
          rect.top = 0;
        }
        var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;
        var screen = displayHeight(cm),
          result = {};
        if (rect.bottom - rect.top > screen) {
          rect.bottom = rect.top + screen;
        }
        var docBottom = cm.doc.height + paddingVert(display);
        var atTop = rect.top < snapMargin,
          atBottom = rect.bottom > docBottom - snapMargin;
        if (rect.top < screentop) {
          result.scrollTop = atTop ? 0 : rect.top;
        } else if (rect.bottom > screentop + screen) {
          var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen);
          if (newTop != screentop) {
            result.scrollTop = newTop;
          }
        }

        var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft;
        var screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0);
        var tooWide = rect.right - rect.left > screenw;
        if (tooWide) {
          rect.right = rect.left + screenw;
        }
        if (rect.left < 10) {
          result.scrollLeft = 0;
        } else if (rect.left < screenleft) {
          result.scrollLeft = Math.max(0, rect.left - (tooWide ? 0 : 10));
        } else if (rect.right > screenw + screenleft - 3) {
          result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw;
        }
        return result
      }

      // Store a relative adjustment to the scroll position in the current
      // operation (to be applied when the operation finishes).
      function addToScrollTop(cm, top) {
        if (top == null) {
          return
        }
        resolveScrollToPos(cm);
        cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;
      }

      // Make sure that at the end of the operation the current cursor is
      // shown.
      function ensureCursorVisible(cm) {
        resolveScrollToPos(cm);
        var cur = cm.getCursor();
        cm.curOp.scrollToPos = {
          from: cur,
          to: cur,
          margin: cm.options.cursorScrollMargin
        };
      }

      function scrollToCoords(cm, x, y) {
        if (x != null || y != null) {
          resolveScrollToPos(cm);
        }
        if (x != null) {
          cm.curOp.scrollLeft = x;
        }
        if (y != null) {
          cm.curOp.scrollTop = y;
        }
      }

      function scrollToRange(cm, range$$1) {
        resolveScrollToPos(cm);
        cm.curOp.scrollToPos = range$$1;
      }

      // When an operation has its scrollToPos property set, and another
      // scroll action is applied before the end of the operation, this
      // 'simulates' scrolling that position into view in a cheap way, so
      // that the effect of intermediate scroll commands is not ignored.
      function resolveScrollToPos(cm) {
        var range$$1 = cm.curOp.scrollToPos;
        if (range$$1) {
          cm.curOp.scrollToPos = null;
          var from = estimateCoords(cm, range$$1.from),
            to = estimateCoords(cm, range$$1.to);
          scrollToCoordsRange(cm, from, to, range$$1.margin);
        }
      }

      function scrollToCoordsRange(cm, from, to, margin) {
        var sPos = calculateScrollPos(cm, {
          left: Math.min(from.left, to.left),
          top: Math.min(from.top, to.top) - margin,
          right: Math.max(from.right, to.right),
          bottom: Math.max(from.bottom, to.bottom) + margin
        });
        scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop);
      }

      // Sync the scrollable area and scrollbars, ensure the viewport
      // covers the visible area.
      function updateScrollTop(cm, val) {
        if (Math.abs(cm.doc.scrollTop - val) < 2) {
          return
        }
        if (!gecko) {
          updateDisplaySimple(cm, {
            top: val
          });
        }
        setScrollTop(cm, val, true);
        if (gecko) {
          updateDisplaySimple(cm);
        }
        startWorker(cm, 100);
      }

      function setScrollTop(cm, val, forceScroll) {
        val = Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val);
        if (cm.display.scroller.scrollTop == val && !forceScroll) {
          return
        }
        cm.doc.scrollTop = val;
        cm.display.scrollbars.setScrollTop(val);
        if (cm.display.scroller.scrollTop != val) {
          cm.display.scroller.scrollTop = val;
        }
      }

      // Sync scroller and scrollbar, ensure the gutter elements are
      // aligned.
      function setScrollLeft(cm, val, isScroller, forceScroll) {
        val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth);
        if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) {
          return
        }
        cm.doc.scrollLeft = val;
        alignHorizontally(cm);
        if (cm.display.scroller.scrollLeft != val) {
          cm.display.scroller.scrollLeft = val;
        }
        cm.display.scrollbars.setScrollLeft(val);
      }

      // SCROLLBARS

      // Prepare DOM reads needed to update the scrollbars. Done in one
      // shot to minimize update/measure roundtrips.
      function measureForScrollbars(cm) {
        var d = cm.display,
          gutterW = d.gutters.offsetWidth;
        var docH = Math.round(cm.doc.height + paddingVert(cm.display));
        return {
          clientHeight: d.scroller.clientHeight,
          viewHeight: d.wrapper.clientHeight,
          scrollWidth: d.scroller.scrollWidth,
          clientWidth: d.scroller.clientWidth,
          viewWidth: d.wrapper.clientWidth,
          barLeft: cm.options.fixedGutter ? gutterW : 0,
          docHeight: docH,
          scrollHeight: docH + scrollGap(cm) + d.barHeight,
          nativeBarWidth: d.nativeBarWidth,
          gutterWidth: gutterW
        }
      }

      var NativeScrollbars = function(place, scroll, cm) {
        this.cm = cm;
        var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
        var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
        place(vert);
        place(horiz);

        on(vert, "scroll", function() {
          if (vert.clientHeight) {
            scroll(vert.scrollTop, "vertical");
          }
        });
        on(horiz, "scroll", function() {
          if (horiz.clientWidth) {
            scroll(horiz.scrollLeft, "horizontal");
          }
        });

        this.checkedZeroWidth = false;
        // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
        if (ie && ie_version < 8) {
          this.horiz.style.minHeight = this.vert.style.minWidth = "18px";
        }
      };

      NativeScrollbars.prototype.update = function(measure) {
        var needsH = measure.scrollWidth > measure.clientWidth + 1;
        var needsV = measure.scrollHeight > measure.clientHeight + 1;
        var sWidth = measure.nativeBarWidth;

        if (needsV) {
          this.vert.style.display = "block";
          this.vert.style.bottom = needsH ? sWidth + "px" : "0";
          var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);
          // A bug in IE8 can cause this value to be negative, so guard it.
          this.vert.firstChild.style.height =
            Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px";
        } else {
          this.vert.style.display = "";
          this.vert.firstChild.style.height = "0";
        }

        if (needsH) {
          this.horiz.style.display = "block";
          this.horiz.style.right = needsV ? sWidth + "px" : "0";
          this.horiz.style.left = measure.barLeft + "px";
          var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
          this.horiz.firstChild.style.width =
            Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
        } else {
          this.horiz.style.display = "";
          this.horiz.firstChild.style.width = "0";
        }

        if (!this.checkedZeroWidth && measure.clientHeight > 0) {
          if (sWidth == 0) {
            this.zeroWidthHack();
          }
          this.checkedZeroWidth = true;
        }

        return {
          right: needsV ? sWidth : 0,
          bottom: needsH ? sWidth : 0
        }
      };

      NativeScrollbars.prototype.setScrollLeft = function(pos) {
        if (this.horiz.scrollLeft != pos) {
          this.horiz.scrollLeft = pos;
        }
        if (this.disableHoriz) {
          this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz");
        }
      };

      NativeScrollbars.prototype.setScrollTop = function(pos) {
        if (this.vert.scrollTop != pos) {
          this.vert.scrollTop = pos;
        }
        if (this.disableVert) {
          this.enableZeroWidthBar(this.vert, this.disableVert, "vert");
        }
      };

      NativeScrollbars.prototype.zeroWidthHack = function() {
        var w = mac && !mac_geMountainLion ? "12px" : "18px";
        this.horiz.style.height = this.vert.style.width = w;
        this.horiz.style.pointerEvents = this.vert.style.pointerEvents = "none";
        this.disableHoriz = new Delayed;
        this.disableVert = new Delayed;
      };

      NativeScrollbars.prototype.enableZeroWidthBar = function(bar, delay, type) {
        bar.style.pointerEvents = "auto";

        function maybeDisable() {
          // To find out whether the scrollbar is still visible, we
          // check whether the element under the pixel in the bottom
          // right corner of the scrollbar box is the scrollbar box
          // itself (when the bar is still visible) or its filler child
          // (when the bar is hidden). If it is still visible, we keep
          // it enabled, if it's hidden, we disable pointer events.
          var box = bar.getBoundingClientRect();
          var elt$$1 = type == "vert" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2) :
            document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1);
          if (elt$$1 != bar) {
            bar.style.pointerEvents = "none";
          } else {
            delay.set(1000, maybeDisable);
          }
        }
        delay.set(1000, maybeDisable);
      };

      NativeScrollbars.prototype.clear = function() {
        var parent = this.horiz.parentNode;
        parent.removeChild(this.horiz);
        parent.removeChild(this.vert);
      };

      var NullScrollbars = function() {};

      NullScrollbars.prototype.update = function() {
        return {
          bottom: 0,
          right: 0
        }
      };
      NullScrollbars.prototype.setScrollLeft = function() {};
      NullScrollbars.prototype.setScrollTop = function() {};
      NullScrollbars.prototype.clear = function() {};

      function updateScrollbars(cm, measure) {
        if (!measure) {
          measure = measureForScrollbars(cm);
        }
        var startWidth = cm.display.barWidth,
          startHeight = cm.display.barHeight;
        updateScrollbarsInner(cm, measure);
        for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
          if (startWidth != cm.display.barWidth && cm.options.lineWrapping) {
            updateHeightsInViewport(cm);
          }
          updateScrollbarsInner(cm, measureForScrollbars(cm));
          startWidth = cm.display.barWidth;
          startHeight = cm.display.barHeight;
        }
      }

      // Re-synchronize the fake scrollbars with the actual size of the
      // content.
      function updateScrollbarsInner(cm, measure) {
        var d = cm.display;
        var sizes = d.scrollbars.update(measure);

        d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
        d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";
        d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent";

        if (sizes.right && sizes.bottom) {
          d.scrollbarFiller.style.display = "block";
          d.scrollbarFiller.style.height = sizes.bottom + "px";
          d.scrollbarFiller.style.width = sizes.right + "px";
        } else {
          d.scrollbarFiller.style.display = "";
        }
        if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
          d.gutterFiller.style.display = "block";
          d.gutterFiller.style.height = sizes.bottom + "px";
          d.gutterFiller.style.width = measure.gutterWidth + "px";
        } else {
          d.gutterFiller.style.display = "";
        }
      }

      var scrollbarModel = {
        "native": NativeScrollbars,
        "null": NullScrollbars
      };

      function initScrollbars(cm) {
        if (cm.display.scrollbars) {
          cm.display.scrollbars.clear();
          if (cm.display.scrollbars.addClass) {
            rmClass(cm.display.wrapper, cm.display.scrollbars.addClass);
          }
        }

        cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function(node) {
          cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
          // Prevent clicks in the scrollbars from killing focus
          on(node, "mousedown", function() {
            if (cm.state.focused) {
              setTimeout(function() {
                return cm.display.input.focus();
              }, 0);
            }
          });
          node.setAttribute("cm-not-content", "true");
        }, function(pos, axis) {
          if (axis == "horizontal") {
            setScrollLeft(cm, pos);
          } else {
            updateScrollTop(cm, pos);
          }
        }, cm);
        if (cm.display.scrollbars.addClass) {
          addClass(cm.display.wrapper, cm.display.scrollbars.addClass);
        }
      }

      // Operations are used to wrap a series of changes to the editor
      // state in such a way that each change won't have to update the
      // cursor and display (which would be awkward, slow, and
      // error-prone). Instead, display updates are batched and then all
      // combined and executed at once.

      var nextOpId = 0;
      // Start a new operation.
      function startOperation(cm) {
        cm.curOp = {
          cm: cm,
          viewChanged: false, // Flag that indicates that lines might need to be redrawn
          startHeight: cm.doc.height, // Used to detect need to update scrollbar
          forceUpdate: false, // Used to force a redraw
          updateInput: null, // Whether to reset the input textarea
          typing: false, // Whether this reset should be careful to leave existing text (for compositing)
          changeObjs: null, // Accumulated changes, for firing change events
          cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
          cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
          selectionChanged: false, // Whether the selection needs to be redrawn
          updateMaxLine: false, // Set when the widest line needs to be determined anew
          scrollLeft: null,
          scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
          scrollToPos: null, // Used to scroll to a specific position
          focus: false,
          id: ++nextOpId // Unique ID
        };
        pushOperation(cm.curOp);
      }

      // Finish an operation, updating the display and signalling delayed events
      function endOperation(cm) {
        var op = cm.curOp;
        finishOperation(op, function(group) {
          for (var i = 0; i < group.ops.length; i++) {
            group.ops[i].cm.curOp = null;
          }
          endOperations(group);
        });
      }

      // The DOM updates done when an operation finishes are batched so
      // that the minimum number of relayouts are required.
      function endOperations(group) {
        var ops = group.ops;
        for (var i = 0; i < ops.length; i++) // Read DOM
        {
          endOperation_R1(ops[i]);
        }
        for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)
        {
          endOperation_W1(ops[i$1]);
        }
        for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM
        {
          endOperation_R2(ops[i$2]);
        }
        for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)
        {
          endOperation_W2(ops[i$3]);
        }
        for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM
        {
          endOperation_finish(ops[i$4]);
        }
      }

      function endOperation_R1(op) {
        var cm = op.cm,
          display = cm.display;
        maybeClipScrollbars(cm);
        if (op.updateMaxLine) {
          findMaxLine(cm);
        }

        op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||
          op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
            op.scrollToPos.to.line >= display.viewTo) ||
          display.maxLineChanged && cm.options.lineWrapping;
        op.update = op.mustUpdate &&
          new DisplayUpdate(cm, op.mustUpdate && {
            top: op.scrollTop,
            ensure: op.scrollToPos
          }, op.forceUpdate);
      }

      function endOperation_W1(op) {
        op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
      }

      function endOperation_R2(op) {
        var cm = op.cm,
          display = cm.display;
        if (op.updatedDisplay) {
          updateHeightsInViewport(cm);
        }

        op.barMeasure = measureForScrollbars(cm);

        // If the max line changed since it was last measured, measure it,
        // and ensure the document's width matches it.
        // updateDisplay_W2 will use these properties to do the actual resizing
        if (display.maxLineChanged && !cm.options.lineWrapping) {
          op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
          cm.display.sizerWidth = op.adjustWidthTo;
          op.barMeasure.scrollWidth =
            Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
          op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
        }

        if (op.updatedDisplay || op.selectionChanged) {
          op.preparedSelection = display.input.prepareSelection();
        }
      }

      function endOperation_W2(op) {
        var cm = op.cm;

        if (op.adjustWidthTo != null) {
          cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
          if (op.maxScrollLeft < cm.doc.scrollLeft) {
            setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true);
          }
          cm.display.maxLineChanged = false;
        }

        var takeFocus = op.focus && op.focus == activeElt();
        if (op.preparedSelection) {
          cm.display.input.showSelection(op.preparedSelection, takeFocus);
        }
        if (op.updatedDisplay || op.startHeight != cm.doc.height) {
          updateScrollbars(cm, op.barMeasure);
        }
        if (op.updatedDisplay) {
          setDocumentHeight(cm, op.barMeasure);
        }

        if (op.selectionChanged) {
          restartBlink(cm);
        }

        if (cm.state.focused && op.updateInput) {
          cm.display.input.reset(op.typing);
        }
        if (takeFocus) {
          ensureFocus(op.cm);
        }
      }

      function endOperation_finish(op) {
        var cm = op.cm,
          display = cm.display,
          doc = cm.doc;

        if (op.updatedDisplay) {
          postUpdateDisplay(cm, op.update);
        }

        // Abort mouse wheel delta measurement, when scrolling explicitly
        if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos)) {
          display.wheelStartX = display.wheelStartY = null;
        }

        // Propagate the scroll position to the actual DOM scroller
        if (op.scrollTop != null) {
          setScrollTop(cm, op.scrollTop, op.forceScroll);
        }

        if (op.scrollLeft != null) {
          setScrollLeft(cm, op.scrollLeft, true, true);
        }
        // If we need to scroll a specific position into view, do so.
        if (op.scrollToPos) {
          var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
            clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
          maybeScrollWindow(cm, rect);
        }

        // Fire events for markers that are hidden/unidden by editing or
        // undoing
        var hidden = op.maybeHiddenMarkers,
          unhidden = op.maybeUnhiddenMarkers;
        if (hidden) {
          for (var i = 0; i < hidden.length; ++i) {
            if (!hidden[i].lines.length) {
              signal(hidden[i], "hide");
            }
          }
        }
        if (unhidden) {
          for (var i$1 = 0; i$1 < unhidden.length; ++i$1) {
            if (unhidden[i$1].lines.length) {
              signal(unhidden[i$1], "unhide");
            }
          }
        }

        if (display.wrapper.offsetHeight) {
          doc.scrollTop = cm.display.scroller.scrollTop;
        }

        // Fire change events, and delayed event handlers
        if (op.changeObjs) {
          signal(cm, "changes", cm, op.changeObjs);
        }
        if (op.update) {
          op.update.finish();
        }
      }

      // Run the given function in an operation
      function runInOp(cm, f) {
        if (cm.curOp) {
          return f()
        }
        startOperation(cm);
        try {
          return f()
        } finally {
          endOperation(cm);
        }
      }
      // Wraps a function in an operation. Returns the wrapped function.
      function operation(cm, f) {
        return function() {
          if (cm.curOp) {
            return f.apply(cm, arguments)
          }
          startOperation(cm);
          try {
            return f.apply(cm, arguments)
          } finally {
            endOperation(cm);
          }
        }
      }
      // Used to add methods to editor and doc instances, wrapping them in
      // operations.
      function methodOp(f) {
        return function() {
          if (this.curOp) {
            return f.apply(this, arguments)
          }
          startOperation(this);
          try {
            return f.apply(this, arguments)
          } finally {
            endOperation(this);
          }
        }
      }

      function docMethodOp(f) {
        return function() {
          var cm = this.cm;
          if (!cm || cm.curOp) {
            return f.apply(this, arguments)
          }
          startOperation(cm);
          try {
            return f.apply(this, arguments)
          } finally {
            endOperation(cm);
          }
        }
      }

      // Updates the display.view data structure for a given change to the
      // document. From and to are in pre-change coordinates. Lendiff is
      // the amount of lines added or subtracted by the change. This is
      // used for changes that span multiple lines, or change the way
      // lines are divided into visual lines. regLineChange (below)
      // registers single-line changes.
      function regChange(cm, from, to, lendiff) {
        if (from == null) {
          from = cm.doc.first;
        }
        if (to == null) {
          to = cm.doc.first + cm.doc.size;
        }
        if (!lendiff) {
          lendiff = 0;
        }

        var display = cm.display;
        if (lendiff && to < display.viewTo &&
          (display.updateLineNumbers == null || display.updateLineNumbers > from)) {
          display.updateLineNumbers = from;
        }

        cm.curOp.viewChanged = true;

        if (from >= display.viewTo) { // Change after
          if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo) {
            resetView(cm);
          }
        } else if (to <= display.viewFrom) { // Change before
          if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
            resetView(cm);
          } else {
            display.viewFrom += lendiff;
            display.viewTo += lendiff;
          }
        } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
          resetView(cm);
        } else if (from <= display.viewFrom) { // Top overlap
          var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
          if (cut) {
            display.view = display.view.slice(cut.index);
            display.viewFrom = cut.lineN;
            display.viewTo += lendiff;
          } else {
            resetView(cm);
          }
        } else if (to >= display.viewTo) { // Bottom overlap
          var cut$1 = viewCuttingPoint(cm, from, from, -1);
          if (cut$1) {
            display.view = display.view.slice(0, cut$1.index);
            display.viewTo = cut$1.lineN;
          } else {
            resetView(cm);
          }
        } else { // Gap in the middle
          var cutTop = viewCuttingPoint(cm, from, from, -1);
          var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
          if (cutTop && cutBot) {
            display.view = display.view.slice(0, cutTop.index)
              .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
              .concat(display.view.slice(cutBot.index));
            display.viewTo += lendiff;
          } else {
            resetView(cm);
          }
        }

        var ext = display.externalMeasured;
        if (ext) {
          if (to < ext.lineN) {
            ext.lineN += lendiff;
          } else if (from < ext.lineN + ext.size) {
            display.externalMeasured = null;
          }
        }
      }

      // Register a change to a single line. Type must be one of "text",
      // "gutter", "class", "widget"
      function regLineChange(cm, line, type) {
        cm.curOp.viewChanged = true;
        var display = cm.display,
          ext = cm.display.externalMeasured;
        if (ext && line >= ext.lineN && line < ext.lineN + ext.size) {
          display.externalMeasured = null;
        }

        if (line < display.viewFrom || line >= display.viewTo) {
          return
        }
        var lineView = display.view[findViewIndex(cm, line)];
        if (lineView.node == null) {
          return
        }
        var arr = lineView.changes || (lineView.changes = []);
        if (indexOf(arr, type) == -1) {
          arr.push(type);
        }
      }

      // Clear the view.
      function resetView(cm) {
        cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
        cm.display.view = [];
        cm.display.viewOffset = 0;
      }

      function viewCuttingPoint(cm, oldN, newN, dir) {
        var index = findViewIndex(cm, oldN),
          diff, view = cm.display.view;
        if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size) {
          return {
            index: index,
            lineN: newN
          }
        }
        var n = cm.display.viewFrom;
        for (var i = 0; i < index; i++) {
          n += view[i].size;
        }
        if (n != oldN) {
          if (dir > 0) {
            if (index == view.length - 1) {
              return null
            }
            diff = (n + view[index].size) - oldN;
            index++;
          } else {
            diff = n - oldN;
          }
          oldN += diff;
          newN += diff;
        }
        while (visualLineNo(cm.doc, newN) != newN) {
          if (index == (dir < 0 ? 0 : view.length - 1)) {
            return null
          }
          newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
          index += dir;
        }
        return {
          index: index,
          lineN: newN
        }
      }

      // Force the view to cover a given range, adding empty view element
      // or clipping off existing ones as needed.
      function adjustView(cm, from, to) {
        var display = cm.display,
          view = display.view;
        if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
          display.view = buildViewArray(cm, from, to);
          display.viewFrom = from;
        } else {
          if (display.viewFrom > from) {
            display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view);
          } else if (display.viewFrom < from) {
            display.view = display.view.slice(findViewIndex(cm, from));
          }
          display.viewFrom = from;
          if (display.viewTo < to) {
            display.view = display.view.concat(buildViewArray(cm, display.viewTo, to));
          } else if (display.viewTo > to) {
            display.view = display.view.slice(0, findViewIndex(cm, to));
          }
        }
        display.viewTo = to;
      }

      // Count the number of lines in the view whose DOM representation is
      // out of date (or nonexistent).
      function countDirtyView(cm) {
        var view = cm.display.view,
          dirty = 0;
        for (var i = 0; i < view.length; i++) {
          var lineView = view[i];
          if (!lineView.hidden && (!lineView.node || lineView.changes)) {
            ++dirty;
          }
        }
        return dirty
      }

      // HIGHLIGHT WORKER

      function startWorker(cm, time) {
        if (cm.doc.highlightFrontier < cm.display.viewTo) {
          cm.state.highlight.set(time, bind(highlightWorker, cm));
        }
      }

      function highlightWorker(cm) {
        var doc = cm.doc;
        if (doc.highlightFrontier >= cm.display.viewTo) {
          return
        }
        var end = +new Date + cm.options.workTime;
        var context = getContextBefore(cm, doc.highlightFrontier);
        var changedLines = [];

        doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function(line) {
          if (context.line >= cm.display.viewFrom) { // Visible
            var oldStyles = line.styles;
            var resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null;
            var highlighted = highlightLine(cm, line, context, true);
            if (resetState) {
              context.state = resetState;
            }
            line.styles = highlighted.styles;
            var oldCls = line.styleClasses,
              newCls = highlighted.classes;
            if (newCls) {
              line.styleClasses = newCls;
            } else if (oldCls) {
              line.styleClasses = null;
            }
            var ischange = !oldStyles || oldStyles.length != line.styles.length ||
              oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);
            for (var i = 0; !ischange && i < oldStyles.length; ++i) {
              ischange = oldStyles[i] != line.styles[i];
            }
            if (ischange) {
              changedLines.push(context.line);
            }
            line.stateAfter = context.save();
            context.nextLine();
          } else {
            if (line.text.length <= cm.options.maxHighlightLength) {
              processLine(cm, line.text, context);
            }
            line.stateAfter = context.line % 5 == 0 ? context.save() : null;
            context.nextLine();
          }
          if (+new Date > end) {
            startWorker(cm, cm.options.workDelay);
            return true
          }
        });
        doc.highlightFrontier = context.line;
        doc.modeFrontier = Math.max(doc.modeFrontier, context.line);
        if (changedLines.length) {
          runInOp(cm, function() {
            for (var i = 0; i < changedLines.length; i++) {
              regLineChange(cm, changedLines[i], "text");
            }
          });
        }
      }

      // DISPLAY DRAWING

      var DisplayUpdate = function(cm, viewport, force) {
        var display = cm.display;

        this.viewport = viewport;
        // Store some values that we'll need later (but don't want to force a relayout for)
        this.visible = visibleLines(display, cm.doc, viewport);
        this.editorIsHidden = !display.wrapper.offsetWidth;
        this.wrapperHeight = display.wrapper.clientHeight;
        this.wrapperWidth = display.wrapper.clientWidth;
        this.oldDisplayWidth = displayWidth(cm);
        this.force = force;
        this.dims = getDimensions(cm);
        this.events = [];
      };

      DisplayUpdate.prototype.signal = function(emitter, type) {
        if (hasHandler(emitter, type)) {
          this.events.push(arguments);
        }
      };
      DisplayUpdate.prototype.finish = function() {
        var this$1 = this;

        for (var i = 0; i < this.events.length; i++) {
          signal.apply(null, this$1.events[i]);
        }
      };

      function maybeClipScrollbars(cm) {
        var display = cm.display;
        if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
          display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;
          display.heightForcer.style.height = scrollGap(cm) + "px";
          display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
          display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
          display.scrollbarsClipped = true;
        }
      }

      function selectionSnapshot(cm) {
        if (cm.hasFocus()) {
          return null
        }
        var active = activeElt();
        if (!active || !contains(cm.display.lineDiv, active)) {
          return null
        }
        var result = {
          activeElt: active
        };
        if (window.getSelection) {
          var sel = window.getSelection();
          if (sel.anchorNode && sel.extend && contains(cm.display.lineDiv, sel.anchorNode)) {
            result.anchorNode = sel.anchorNode;
            result.anchorOffset = sel.anchorOffset;
            result.focusNode = sel.focusNode;
            result.focusOffset = sel.focusOffset;
          }
        }
        return result
      }

      function restoreSelection(snapshot) {
        if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt()) {
          return
        }
        snapshot.activeElt.focus();
        if (snapshot.anchorNode && contains(document.body, snapshot.anchorNode) && contains(document.body, snapshot.focusNode)) {
          var sel = window.getSelection(),
            range$$1 = document.createRange();
          range$$1.setEnd(snapshot.anchorNode, snapshot.anchorOffset);
          range$$1.collapse(false);
          sel.removeAllRanges();
          sel.addRange(range$$1);
          sel.extend(snapshot.focusNode, snapshot.focusOffset);
        }
      }

      // Does the actual updating of the line display. Bails out
      // (returning false) when there is nothing to be done and forced is
      // false.
      function updateDisplayIfNeeded(cm, update) {
        var display = cm.display,
          doc = cm.doc;

        if (update.editorIsHidden) {
          resetView(cm);
          return false
        }

        // Bail out if the visible area is already rendered and nothing changed.
        if (!update.force &&
          update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
          (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
          display.renderedView == display.view && countDirtyView(cm) == 0) {
          return false
        }

        if (maybeUpdateLineNumberWidth(cm)) {
          resetView(cm);
          update.dims = getDimensions(cm);
        }

        // Compute a suitable new viewport (from & to)
        var end = doc.first + doc.size;
        var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);
        var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
        if (display.viewFrom < from && from - display.viewFrom < 20) {
          from = Math.max(doc.first, display.viewFrom);
        }
        if (display.viewTo > to && display.viewTo - to < 20) {
          to = Math.min(end, display.viewTo);
        }
        if (sawCollapsedSpans) {
          from = visualLineNo(cm.doc, from);
          to = visualLineEndNo(cm.doc, to);
        }

        var different = from != display.viewFrom || to != display.viewTo ||
          display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;
        adjustView(cm, from, to);

        display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
        // Position the mover div to align with the current scroll position
        cm.display.mover.style.top = display.viewOffset + "px";

        var toUpdate = countDirtyView(cm);
        if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
          (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo)) {
          return false
        }

        // For big changes, we hide the enclosing element during the
        // update, since that speeds up the operations on most browsers.
        var selSnapshot = selectionSnapshot(cm);
        if (toUpdate > 4) {
          display.lineDiv.style.display = "none";
        }
        patchDisplay(cm, display.updateLineNumbers, update.dims);
        if (toUpdate > 4) {
          display.lineDiv.style.display = "";
        }
        display.renderedView = display.view;
        // There might have been a widget with a focused element that got
        // hidden or updated, if so re-focus it.
        restoreSelection(selSnapshot);

        // Prevent selection and cursors from interfering with the scroll
        // width and height.
        removeChildren(display.cursorDiv);
        removeChildren(display.selectionDiv);
        display.gutters.style.height = display.sizer.style.minHeight = 0;

        if (different) {
          display.lastWrapHeight = update.wrapperHeight;
          display.lastWrapWidth = update.wrapperWidth;
          startWorker(cm, 400);
        }

        display.updateLineNumbers = null;

        return true
      }

      function postUpdateDisplay(cm, update) {
        var viewport = update.viewport;

        for (var first = true;; first = false) {
          if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
            // Clip forced viewport to actual scrollable area.
            if (viewport && viewport.top != null) {
              viewport = {
                top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)
              };
            }
            // Updated line heights might result in the drawn area not
            // actually covering the viewport. Keep looping until it does.
            update.visible = visibleLines(cm.display, cm.doc, viewport);
            if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo) {
              break
            }
          }
          if (!updateDisplayIfNeeded(cm, update)) {
            break
          }
          updateHeightsInViewport(cm);
          var barMeasure = measureForScrollbars(cm);
          updateSelection(cm);
          updateScrollbars(cm, barMeasure);
          setDocumentHeight(cm, barMeasure);
          update.force = false;
        }

        update.signal(cm, "update", cm);
        if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
          update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
          cm.display.reportedViewFrom = cm.display.viewFrom;
          cm.display.reportedViewTo = cm.display.viewTo;
        }
      }

      function updateDisplaySimple(cm, viewport) {
        var update = new DisplayUpdate(cm, viewport);
        if (updateDisplayIfNeeded(cm, update)) {
          updateHeightsInViewport(cm);
          postUpdateDisplay(cm, update);
          var barMeasure = measureForScrollbars(cm);
          updateSelection(cm);
          updateScrollbars(cm, barMeasure);
          setDocumentHeight(cm, barMeasure);
          update.finish();
        }
      }

      // Sync the actual display DOM structure with display.view, removing
      // nodes for lines that are no longer in view, and creating the ones
      // that are not there yet, and updating the ones that are out of
      // date.
      function patchDisplay(cm, updateNumbersFrom, dims) {
        var display = cm.display,
          lineNumbers = cm.options.lineNumbers;
        var container = display.lineDiv,
          cur = container.firstChild;

        function rm(node) {
          var next = node.nextSibling;
          // Works around a throw-scroll bug in OS X Webkit
          if (webkit && mac && cm.display.currentWheelTarget == node) {
            node.style.display = "none";
          } else {
            node.parentNode.removeChild(node);
          }
          return next
        }

        var view = display.view,
          lineN = display.viewFrom;
        // Loop over the elements in the view, syncing cur (the DOM nodes
        // in display.lineDiv) with the view as we go.
        for (var i = 0; i < view.length; i++) {
          var lineView = view[i];
          if (lineView.hidden) {} else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
            var node = buildLineElement(cm, lineView, lineN, dims);
            container.insertBefore(node, cur);
          } else { // Already drawn
            while (cur != lineView.node) {
              cur = rm(cur);
            }
            var updateNumber = lineNumbers && updateNumbersFrom != null &&
              updateNumbersFrom <= lineN && lineView.lineNumber;
            if (lineView.changes) {
              if (indexOf(lineView.changes, "gutter") > -1) {
                updateNumber = false;
              }
              updateLineForChanges(cm, lineView, lineN, dims);
            }
            if (updateNumber) {
              removeChildren(lineView.lineNumber);
              lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
            }
            cur = lineView.node.nextSibling;
          }
          lineN += lineView.size;
        }
        while (cur) {
          cur = rm(cur);
        }
      }

      function updateGutterSpace(cm) {
        var width = cm.display.gutters.offsetWidth;
        cm.display.sizer.style.marginLeft = width + "px";
      }

      function setDocumentHeight(cm, measure) {
        cm.display.sizer.style.minHeight = measure.docHeight + "px";
        cm.display.heightForcer.style.top = measure.docHeight + "px";
        cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px";
      }

      // Rebuild the gutter elements, ensure the margin to the left of the
      // code matches their width.
      function updateGutters(cm) {
        var gutters = cm.display.gutters,
          specs = cm.options.gutters;
        removeChildren(gutters);
        var i = 0;
        for (; i < specs.length; ++i) {
          var gutterClass = specs[i];
          var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass));
          if (gutterClass == "CodeMirror-linenumbers") {
            cm.display.lineGutter = gElt;
            gElt.style.width = (cm.display.lineNumWidth || 1) + "px";
          }
        }
        gutters.style.display = i ? "" : "none";
        updateGutterSpace(cm);
      }

      // Make sure the gutters options contains the element
      // "CodeMirror-linenumbers" when the lineNumbers option is true.
      function setGuttersForLineNumbers(options) {
        var found = indexOf(options.gutters, "CodeMirror-linenumbers");
        if (found == -1 && options.lineNumbers) {
          options.gutters = options.gutters.concat(["CodeMirror-linenumbers"]);
        } else if (found > -1 && !options.lineNumbers) {
          options.gutters = options.gutters.slice(0);
          options.gutters.splice(found, 1);
        }
      }

      // Since the delta values reported on mouse wheel events are
      // unstandardized between browsers and even browser versions, and
      // generally horribly unpredictable, this code starts by measuring
      // the scroll effect that the first few mouse wheel events have,
      // and, from that, detects the way it can convert deltas to pixel
      // offsets afterwards.
      //
      // The reason we want to know the amount a wheel event will scroll
      // is that it gives us a chance to update the display before the
      // actual scrolling happens, reducing flickering.

      var wheelSamples = 0;
      var wheelPixelsPerUnit = null;
      // Fill in a browser-detected starting value on browsers where we
      // know one. These don't have to be accurate -- the result of them
      // being wrong would just be a slight flicker on the first wheel
      // scroll (if it is large enough).
      if (ie) {
        wheelPixelsPerUnit = -.53;
      } else if (gecko) {
        wheelPixelsPerUnit = 15;
      } else if (chrome) {
        wheelPixelsPerUnit = -.7;
      } else if (safari) {
        wheelPixelsPerUnit = -1 / 3;
      }

      function wheelEventDelta(e) {
        var dx = e.wheelDeltaX,
          dy = e.wheelDeltaY;
        if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) {
          dx = e.detail;
        }
        if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) {
          dy = e.detail;
        } else if (dy == null) {
          dy = e.wheelDelta;
        }
        return {
          x: dx,
          y: dy
        }
      }

      function wheelEventPixels(e) {
        var delta = wheelEventDelta(e);
        delta.x *= wheelPixelsPerUnit;
        delta.y *= wheelPixelsPerUnit;
        return delta
      }

      function onScrollWheel(cm, e) {
        var delta = wheelEventDelta(e),
          dx = delta.x,
          dy = delta.y;

        var display = cm.display,
          scroll = display.scroller;
        // Quit if there's nothing to scroll here
        var canScrollX = scroll.scrollWidth > scroll.clientWidth;
        var canScrollY = scroll.scrollHeight > scroll.clientHeight;
        if (!(dx && canScrollX || dy && canScrollY)) {
          return
        }

        // Webkit browsers on OS X abort momentum scrolls when the target
        // of the scroll event is removed from the scrollable element.
        // This hack (see related code in patchDisplay) makes sure the
        // element is kept around.
        if (dy && mac && webkit) {
          outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
            for (var i = 0; i < view.length; i++) {
              if (view[i].node == cur) {
                cm.display.currentWheelTarget = cur;
                break outer
              }
            }
          }
        }

        // On some browsers, horizontal scrolling will cause redraws to
        // happen before the gutter has been realigned, causing it to
        // wriggle around in a most unseemly way. When we have an
        // estimated pixels/delta value, we just handle horizontal
        // scrolling entirely here. It'll be slightly off from native, but
        // better than glitching out.
        if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
          if (dy && canScrollY) {
            updateScrollTop(cm, Math.max(0, scroll.scrollTop + dy * wheelPixelsPerUnit));
          }
          setScrollLeft(cm, Math.max(0, scroll.scrollLeft + dx * wheelPixelsPerUnit));
          // Only prevent default scrolling if vertical scrolling is
          // actually possible. Otherwise, it causes vertical scroll
          // jitter on OSX trackpads when deltaX is small and deltaY
          // is large (issue #3579)
          if (!dy || (dy && canScrollY)) {
            e_preventDefault(e);
          }
          display.wheelStartX = null; // Abort measurement, if in progress
          return
        }

        // 'Project' the visible viewport to cover the area that is being
        // scrolled into view (if we know enough to estimate it).
        if (dy && wheelPixelsPerUnit != null) {
          var pixels = dy * wheelPixelsPerUnit;
          var top = cm.doc.scrollTop,
            bot = top + display.wrapper.clientHeight;
          if (pixels < 0) {
            top = Math.max(0, top + pixels - 50);
          } else {
            bot = Math.min(cm.doc.height, bot + pixels + 50);
          }
          updateDisplaySimple(cm, {
            top: top,
            bottom: bot
          });
        }

        if (wheelSamples < 20) {
          if (display.wheelStartX == null) {
            display.wheelStartX = scroll.scrollLeft;
            display.wheelStartY = scroll.scrollTop;
            display.wheelDX = dx;
            display.wheelDY = dy;
            setTimeout(function() {
              if (display.wheelStartX == null) {
                return
              }
              var movedX = scroll.scrollLeft - display.wheelStartX;
              var movedY = scroll.scrollTop - display.wheelStartY;
              var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
                (movedX && display.wheelDX && movedX / display.wheelDX);
              display.wheelStartX = display.wheelStartY = null;
              if (!sample) {
                return
              }
              wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
              ++wheelSamples;
            }, 200);
          } else {
            display.wheelDX += dx;
            display.wheelDY += dy;
          }
        }
      }

      // Selection objects are immutable. A new one is created every time
      // the selection changes. A selection is one or more non-overlapping
      // (and non-touching) ranges, sorted, and an integer that indicates
      // which one is the primary selection (the one that's scrolled into
      // view, that getCursor returns, etc).
      var Selection = function(ranges, primIndex) {
        this.ranges = ranges;
        this.primIndex = primIndex;
      };

      Selection.prototype.primary = function() {
        return this.ranges[this.primIndex]
      };

      Selection.prototype.equals = function(other) {
        var this$1 = this;

        if (other == this) {
          return true
        }
        if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) {
          return false
        }
        for (var i = 0; i < this.ranges.length; i++) {
          var here = this$1.ranges[i],
            there = other.ranges[i];
          if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) {
            return false
          }
        }
        return true
      };

      Selection.prototype.deepCopy = function() {
        var this$1 = this;

        var out = [];
        for (var i = 0; i < this.ranges.length; i++) {
          out[i] = new Range(copyPos(this$1.ranges[i].anchor), copyPos(this$1.ranges[i].head));
        }
        return new Selection(out, this.primIndex)
      };

      Selection.prototype.somethingSelected = function() {
        var this$1 = this;

        for (var i = 0; i < this.ranges.length; i++) {
          if (!this$1.ranges[i].empty()) {
            return true
          }
        }
        return false
      };

      Selection.prototype.contains = function(pos, end) {
        var this$1 = this;

        if (!end) {
          end = pos;
        }
        for (var i = 0; i < this.ranges.length; i++) {
          var range = this$1.ranges[i];
          if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0) {
            return i
          }
        }
        return -1
      };

      var Range = function(anchor, head) {
        this.anchor = anchor;
        this.head = head;
      };

      Range.prototype.from = function() {
        return minPos(this.anchor, this.head)
      };
      Range.prototype.to = function() {
        return maxPos(this.anchor, this.head)
      };
      Range.prototype.empty = function() {
        return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch
      };

      // Take an unsorted, potentially overlapping set of ranges, and
      // build a selection out of it. 'Consumes' ranges array (modifying
      // it).
      function normalizeSelection(ranges, primIndex) {
        var prim = ranges[primIndex];
        ranges.sort(function(a, b) {
          return cmp(a.from(), b.from());
        });
        primIndex = indexOf(ranges, prim);
        for (var i = 1; i < ranges.length; i++) {
          var cur = ranges[i],
            prev = ranges[i - 1];
          if (cmp(prev.to(), cur.from()) >= 0) {
            var from = minPos(prev.from(), cur.from()),
              to = maxPos(prev.to(), cur.to());
            var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;
            if (i <= primIndex) {
              --primIndex;
            }
            ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
          }
        }
        return new Selection(ranges, primIndex)
      }

      function simpleSelection(anchor, head) {
        return new Selection([new Range(anchor, head || anchor)], 0)
      }

      // Compute the position of the end of a change (its 'to' property
      // refers to the pre-change end).
      function changeEnd(change) {
        if (!change.text) {
          return change.to
        }
        return Pos(change.from.line + change.text.length - 1,
          lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))
      }

      // Adjust a position to refer to the post-change position of the
      // same text, or the end of the change if the change covers it.
      function adjustForChange(pos, change) {
        if (cmp(pos, change.from) < 0) {
          return pos
        }
        if (cmp(pos, change.to) <= 0) {
          return changeEnd(change)
        }

        var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1,
          ch = pos.ch;
        if (pos.line == change.to.line) {
          ch += changeEnd(change).ch - change.to.ch;
        }
        return Pos(line, ch)
      }

      function computeSelAfterChange(doc, change) {
        var out = [];
        for (var i = 0; i < doc.sel.ranges.length; i++) {
          var range = doc.sel.ranges[i];
          out.push(new Range(adjustForChange(range.anchor, change),
            adjustForChange(range.head, change)));
        }
        return normalizeSelection(out, doc.sel.primIndex)
      }

      function offsetPos(pos, old, nw) {
        if (pos.line == old.line) {
          return Pos(nw.line, pos.ch - old.ch + nw.ch)
        } else {
          return Pos(nw.line + (pos.line - old.line), pos.ch)
        }
      }

      // Used by replaceSelections to allow moving the selection to the
      // start or around the replaced test. Hint may be "start" or "around".
      function computeReplacedSel(doc, changes, hint) {
        var out = [];
        var oldPrev = Pos(doc.first, 0),
          newPrev = oldPrev;
        for (var i = 0; i < changes.length; i++) {
          var change = changes[i];
          var from = offsetPos(change.from, oldPrev, newPrev);
          var to = offsetPos(changeEnd(change), oldPrev, newPrev);
          oldPrev = change.to;
          newPrev = to;
          if (hint == "around") {
            var range = doc.sel.ranges[i],
              inv = cmp(range.head, range.anchor) < 0;
            out[i] = new Range(inv ? to : from, inv ? from : to);
          } else {
            out[i] = new Range(from, from);
          }
        }
        return new Selection(out, doc.sel.primIndex)
      }

      // Used to get the editor into a consistent state again when options change.

      function loadMode(cm) {
        cm.doc.mode = getMode(cm.options, cm.doc.modeOption);
        resetModeState(cm);
      }

      function resetModeState(cm) {
        cm.doc.iter(function(line) {
          if (line.stateAfter) {
            line.stateAfter = null;
          }
          if (line.styles) {
            line.styles = null;
          }
        });
        cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first;
        startWorker(cm, 100);
        cm.state.modeGen++;
        if (cm.curOp) {
          regChange(cm);
        }
      }

      // DOCUMENT DATA STRUCTURE

      // By default, updates that start and end at the beginning of a line
      // are treated specially, in order to make the association of line
      // widgets and marker elements with the text behave more intuitive.
      function isWholeLineUpdate(doc, change) {
        return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
          (!doc.cm || doc.cm.options.wholeLineUpdateBefore)
      }

      // Perform a change on the document data structure.
      function updateDoc(doc, change, markedSpans, estimateHeight$$1) {
        function spansFor(n) {
          return markedSpans ? markedSpans[n] : null
        }

        function update(line, text, spans) {
          updateLine(line, text, spans, estimateHeight$$1);
          signalLater(line, "change", line, change);
        }

        function linesFor(start, end) {
          var result = [];
          for (var i = start; i < end; ++i) {
            result.push(new Line(text[i], spansFor(i), estimateHeight$$1));
          }
          return result
        }

        var from = change.from,
          to = change.to,
          text = change.text;
        var firstLine = getLine(doc, from.line),
          lastLine = getLine(doc, to.line);
        var lastText = lst(text),
          lastSpans = spansFor(text.length - 1),
          nlines = to.line - from.line;

        // Adjust the line structure
        if (change.full) {
          doc.insert(0, linesFor(0, text.length));
          doc.remove(text.length, doc.size - text.length);
        } else if (isWholeLineUpdate(doc, change)) {
          // This is a whole-line replace. Treated specially to make
          // sure line objects move the way they are supposed to.
          var added = linesFor(0, text.length - 1);
          update(lastLine, lastLine.text, lastSpans);
          if (nlines) {
            doc.remove(from.line, nlines);
          }
          if (added.length) {
            doc.insert(from.line, added);
          }
        } else if (firstLine == lastLine) {
          if (text.length == 1) {
            update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
          } else {
            var added$1 = linesFor(1, text.length - 1);
            added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight$$1));
            update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
            doc.insert(from.line + 1, added$1);
          }
        } else if (text.length == 1) {
          update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
          doc.remove(from.line + 1, nlines);
        } else {
          update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
          update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
          var added$2 = linesFor(1, text.length - 1);
          if (nlines > 1) {
            doc.remove(from.line + 1, nlines - 1);
          }
          doc.insert(from.line + 1, added$2);
        }

        signalLater(doc, "change", doc, change);
      }

      // Call f for all linked documents.
      function linkedDocs(doc, f, sharedHistOnly) {
        function propagate(doc, skip, sharedHist) {
          if (doc.linked) {
            for (var i = 0; i < doc.linked.length; ++i) {
              var rel = doc.linked[i];
              if (rel.doc == skip) {
                continue
              }
              var shared = sharedHist && rel.sharedHist;
              if (sharedHistOnly && !shared) {
                continue
              }
              f(rel.doc, shared);
              propagate(rel.doc, doc, shared);
            }
          }
        }
        propagate(doc, null, true);
      }

      // Attach a document to an editor.
      function attachDoc(cm, doc) {
        if (doc.cm) {
          throw new Error("This document is already in use.")
        }
        cm.doc = doc;
        doc.cm = cm;
        estimateLineHeights(cm);
        loadMode(cm);
        setDirectionClass(cm);
        if (!cm.options.lineWrapping) {
          findMaxLine(cm);
        }
        cm.options.mode = doc.modeOption;
        regChange(cm);
      }

      function setDirectionClass(cm) {
        (cm.doc.direction == "rtl" ? addClass : rmClass)(cm.display.lineDiv, "CodeMirror-rtl");
      }

      function directionChanged(cm) {
        runInOp(cm, function() {
          setDirectionClass(cm);
          regChange(cm);
        });
      }

      function History(startGen) {
        // Arrays of change events and selections. Doing something adds an
        // event to done and clears undo. Undoing moves events from done
        // to undone, redoing moves them in the other direction.
        this.done = [];
        this.undone = [];
        this.undoDepth = Infinity;
        // Used to track when changes can be merged into a single undo
        // event
        this.lastModTime = this.lastSelTime = 0;
        this.lastOp = this.lastSelOp = null;
        this.lastOrigin = this.lastSelOrigin = null;
        // Used by the isClean() method
        this.generation = this.maxGeneration = startGen || 1;
      }

      // Create a history change event from an updateDoc-style change
      // object.
      function historyChangeFromChange(doc, change) {
        var histChange = {
          from: copyPos(change.from),
          to: changeEnd(change),
          text: getBetween(doc, change.from, change.to)
        };
        attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
        linkedDocs(doc, function(doc) {
          return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
        }, true);
        return histChange
      }

      // Pop all selection events off the end of a history array. Stop at
      // a change event.
      function clearSelectionEvents(array) {
        while (array.length) {
          var last = lst(array);
          if (last.ranges) {
            array.pop();
          } else {
            break
          }
        }
      }

      // Find the top change event in the history. Pop off selection
      // events that are in the way.
      function lastChangeEvent(hist, force) {
        if (force) {
          clearSelectionEvents(hist.done);
          return lst(hist.done)
        } else if (hist.done.length && !lst(hist.done).ranges) {
          return lst(hist.done)
        } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
          hist.done.pop();
          return lst(hist.done)
        }
      }

      // Register a change in the history. Merges changes that are within
      // a single operation, or are close together with an origin that
      // allows merging (starting with "+") into a single event.
      function addChangeToHistory(doc, change, selAfter, opId) {
        var hist = doc.history;
        hist.undone.length = 0;
        var time = +new Date,
          cur;
        var last;

        if ((hist.lastOp == opId ||
            hist.lastOrigin == change.origin && change.origin &&
            ((change.origin.charAt(0) == "+" && doc.cm && hist.lastModTime > time - doc.cm.options.historyEventDelay) ||
              change.origin.charAt(0) == "*")) &&
          (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
          // Merge this change into the last event
          last = lst(cur.changes);
          if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
            // Optimized case for simple insertion -- don't want to add
            // new changesets for every character typed
            last.to = changeEnd(change);
          } else {
            // Add new sub-event
            cur.changes.push(historyChangeFromChange(doc, change));
          }
        } else {
          // Can not be merged, start a new event.
          var before = lst(hist.done);
          if (!before || !before.ranges) {
            pushSelectionToHistory(doc.sel, hist.done);
          }
          cur = {
            changes: [historyChangeFromChange(doc, change)],
            generation: hist.generation
          };
          hist.done.push(cur);
          while (hist.done.length > hist.undoDepth) {
            hist.done.shift();
            if (!hist.done[0].ranges) {
              hist.done.shift();
            }
          }
        }
        hist.done.push(selAfter);
        hist.generation = ++hist.maxGeneration;
        hist.lastModTime = hist.lastSelTime = time;
        hist.lastOp = hist.lastSelOp = opId;
        hist.lastOrigin = hist.lastSelOrigin = change.origin;

        if (!last) {
          signal(doc, "historyAdded");
        }
      }

      function selectionEventCanBeMerged(doc, origin, prev, sel) {
        var ch = origin.charAt(0);
        return ch == "*" ||
          ch == "+" &&
          prev.ranges.length == sel.ranges.length &&
          prev.somethingSelected() == sel.somethingSelected() &&
          new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)
      }

      // Called whenever the selection changes, sets the new selection as
      // the pending selection in the history, and pushes the old pending
      // selection into the 'done' array when it was significantly
      // different (in number of selected ranges, emptiness, or time).
      function addSelectionToHistory(doc, sel, opId, options) {
        var hist = doc.history,
          origin = options && options.origin;

        // A new event is started when the previous origin does not match
        // the current, or the origins don't allow matching. Origins
        // starting with * are always merged, those starting with + are
        // merged when similar and close together in time.
        if (opId == hist.lastSelOp ||
          (origin && hist.lastSelOrigin == origin &&
            (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
              selectionEventCanBeMerged(doc, origin, lst(hist.done), sel)))) {
          hist.done[hist.done.length - 1] = sel;
        } else {
          pushSelectionToHistory(sel, hist.done);
        }

        hist.lastSelTime = +new Date;
        hist.lastSelOrigin = origin;
        hist.lastSelOp = opId;
        if (options && options.clearRedo !== false) {
          clearSelectionEvents(hist.undone);
        }
      }

      function pushSelectionToHistory(sel, dest) {
        var top = lst(dest);
        if (!(top && top.ranges && top.equals(sel))) {
          dest.push(sel);
        }
      }

      // Used to store marked span information in the history.
      function attachLocalSpans(doc, change, from, to) {
        var existing = change["spans_" + doc.id],
          n = 0;
        doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function(line) {
          if (line.markedSpans) {
            (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans;
          }
          ++n;
        });
      }

      // When un/re-doing restores text containing marked spans, those
      // that have been explicitly cleared should not be restored.
      function removeClearedSpans(spans) {
        if (!spans) {
          return null
        }
        var out;
        for (var i = 0; i < spans.length; ++i) {
          if (spans[i].marker.explicitlyCleared) {
            if (!out) {
              out = spans.slice(0, i);
            }
          } else if (out) {
            out.push(spans[i]);
          }
        }
        return !out ? spans : out.length ? out : null
      }

      // Retrieve and filter the old marked spans stored in a change event.
      function getOldSpans(doc, change) {
        var found = change["spans_" + doc.id];
        if (!found) {
          return null
        }
        var nw = [];
        for (var i = 0; i < change.text.length; ++i) {
          nw.push(removeClearedSpans(found[i]));
        }
        return nw
      }

      // Used for un/re-doing changes from the history. Combines the
      // result of computing the existing spans with the set of spans that
      // existed in the history (so that deleting around a span and then
      // undoing brings back the span).
      function mergeOldSpans(doc, change) {
        var old = getOldSpans(doc, change);
        var stretched = stretchSpansOverChange(doc, change);
        if (!old) {
          return stretched
        }
        if (!stretched) {
          return old
        }

        for (var i = 0; i < old.length; ++i) {
          var oldCur = old[i],
            stretchCur = stretched[i];
          if (oldCur && stretchCur) {
            spans: for (var j = 0; j < stretchCur.length; ++j) {
              var span = stretchCur[j];
              for (var k = 0; k < oldCur.length; ++k) {
                if (oldCur[k].marker == span.marker) {
                  continue spans
                }
              }
              oldCur.push(span);
            }
          }
          else if (stretchCur) {
            old[i] = stretchCur;
          }
        }
        return old
      }

      // Used both to provide a JSON-safe object in .getHistory, and, when
      // detaching a document, to split the history in two
      function copyHistoryArray(events, newGroup, instantiateSel) {
        var copy = [];
        for (var i = 0; i < events.length; ++i) {
          var event = events[i];
          if (event.ranges) {
            copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);
            continue
          }
          var changes = event.changes,
            newChanges = [];
          copy.push({
            changes: newChanges
          });
          for (var j = 0; j < changes.length; ++j) {
            var change = changes[j],
              m = (void 0);
            newChanges.push({
              from: change.from,
              to: change.to,
              text: change.text
            });
            if (newGroup) {
              for (var prop in change) {
                if (m = prop.match(/^spans_(\d+)$/)) {
                  if (indexOf(newGroup, Number(m[1])) > -1) {
                    lst(newChanges)[prop] = change[prop];
                    delete change[prop];
                  }
                }
              }
            }
          }
        }
        return copy
      }

      // The 'scroll' parameter given to many of these indicated whether
      // the new cursor position should be scrolled into view after
      // modifying the selection.

      // If shift is held or the extend flag is set, extends a range to
      // include a given position (and optionally a second position).
      // Otherwise, simply returns the range between the given positions.
      // Used for cursor motion and such.
      function extendRange(range, head, other, extend) {
        if (extend) {
          var anchor = range.anchor;
          if (other) {
            var posBefore = cmp(head, anchor) < 0;
            if (posBefore != (cmp(other, anchor) < 0)) {
              anchor = head;
              head = other;
            } else if (posBefore != (cmp(head, other) < 0)) {
              head = other;
            }
          }
          return new Range(anchor, head)
        } else {
          return new Range(other || head, head)
        }
      }

      // Extend the primary selection range, discard the rest.
      function extendSelection(doc, head, other, options, extend) {
        if (extend == null) {
          extend = doc.cm && (doc.cm.display.shift || doc.extend);
        }
        setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options);
      }

      // Extend all selections (pos is an array of selections with length
      // equal the number of selections)
      function extendSelections(doc, heads, options) {
        var out = [];
        var extend = doc.cm && (doc.cm.display.shift || doc.extend);
        for (var i = 0; i < doc.sel.ranges.length; i++) {
          out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend);
        }
        var newSel = normalizeSelection(out, doc.sel.primIndex);
        setSelection(doc, newSel, options);
      }

      // Updates a single range in the selection.
      function replaceOneSelection(doc, i, range, options) {
        var ranges = doc.sel.ranges.slice(0);
        ranges[i] = range;
        setSelection(doc, normalizeSelection(ranges, doc.sel.primIndex), options);
      }

      // Reset the selection to a single range.
      function setSimpleSelection(doc, anchor, head, options) {
        setSelection(doc, simpleSelection(anchor, head), options);
      }

      // Give beforeSelectionChange handlers a change to influence a
      // selection update.
      function filterSelectionChange(doc, sel, options) {
        var obj = {
          ranges: sel.ranges,
          update: function(ranges) {
            var this$1 = this;

            this.ranges = [];
            for (var i = 0; i < ranges.length; i++) {
              this$1.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
                clipPos(doc, ranges[i].head));
            }
          },
          origin: options && options.origin
        };
        signal(doc, "beforeSelectionChange", doc, obj);
        if (doc.cm) {
          signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
        }
        if (obj.ranges != sel.ranges) {
          return normalizeSelection(obj.ranges, obj.ranges.length - 1)
        } else {
          return sel
        }
      }

      function setSelectionReplaceHistory(doc, sel, options) {
        var done = doc.history.done,
          last = lst(done);
        if (last && last.ranges) {
          done[done.length - 1] = sel;
          setSelectionNoUndo(doc, sel, options);
        } else {
          setSelection(doc, sel, options);
        }
      }

      // Set a new selection.
      function setSelection(doc, sel, options) {
        setSelectionNoUndo(doc, sel, options);
        addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
      }

      function setSelectionNoUndo(doc, sel, options) {
        if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange")) {
          sel = filterSelectionChange(doc, sel, options);
        }

        var bias = options && options.bias ||
          (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
        setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));

        if (!(options && options.scroll === false) && doc.cm) {
          ensureCursorVisible(doc.cm);
        }
      }

      function setSelectionInner(doc, sel) {
        if (sel.equals(doc.sel)) {
          return
        }

        doc.sel = sel;

        if (doc.cm) {
          doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged = true;
          signalCursorActivity(doc.cm);
        }
        signalLater(doc, "cursorActivity", doc);
      }

      // Verify that the selection does not partially select any atomic
      // marked ranges.
      function reCheckSelection(doc) {
        setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false));
      }

      // Return a selection that does not partially select any atomic
      // ranges.
      function skipAtomicInSelection(doc, sel, bias, mayClear) {
        var out;
        for (var i = 0; i < sel.ranges.length; i++) {
          var range = sel.ranges[i];
          var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];
          var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear);
          var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear);
          if (out || newAnchor != range.anchor || newHead != range.head) {
            if (!out) {
              out = sel.ranges.slice(0, i);
            }
            out[i] = new Range(newAnchor, newHead);
          }
        }
        return out ? normalizeSelection(out, sel.primIndex) : sel
      }

      function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
        var line = getLine(doc, pos.line);
        if (line.markedSpans) {
          for (var i = 0; i < line.markedSpans.length; ++i) {
            var sp = line.markedSpans[i],
              m = sp.marker;
            if ((sp.from == null || (m.inclusiveLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
              (sp.to == null || (m.inclusiveRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
              if (mayClear) {
                signal(m, "beforeCursorEnter");
                if (m.explicitlyCleared) {
                  if (!line.markedSpans) {
                    break
                  } else {
                    --i;
                    continue
                  }
                }
              }
              if (!m.atomic) {
                continue
              }

              if (oldPos) {
                var near = m.find(dir < 0 ? 1 : -1),
                  diff = (void 0);
                if (dir < 0 ? m.inclusiveRight : m.inclusiveLeft) {
                  near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null);
                }
                if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0)) {
                  return skipAtomicInner(doc, near, pos, dir, mayClear)
                }
              }

              var far = m.find(dir < 0 ? -1 : 1);
              if (dir < 0 ? m.inclusiveLeft : m.inclusiveRight) {
                far = movePos(doc, far, dir, far.line == pos.line ? line : null);
              }
              return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null
            }
          }
        }
        return pos
      }

      // Ensure a given position is not inside an atomic range.
      function skipAtomic(doc, pos, oldPos, bias, mayClear) {
        var dir = bias || 1;
        var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
          (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
          skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
          (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));
        if (!found) {
          doc.cantEdit = true;
          return Pos(doc.first, 0)
        }
        return found
      }

      function movePos(doc, pos, dir, line) {
        if (dir < 0 && pos.ch == 0) {
          if (pos.line > doc.first) {
            return clipPos(doc, Pos(pos.line - 1))
          } else {
            return null
          }
        } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
          if (pos.line < doc.first + doc.size - 1) {
            return Pos(pos.line + 1, 0)
          } else {
            return null
          }
        } else {
          return new Pos(pos.line, pos.ch + dir)
        }
      }

      function selectAll(cm) {
        cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);
      }

      // UPDATING

      // Allow "beforeChange" event handlers to influence a change
      function filterChange(doc, change, update) {
        var obj = {
          canceled: false,
          from: change.from,
          to: change.to,
          text: change.text,
          origin: change.origin,
          cancel: function() {
            return obj.canceled = true;
          }
        };
        if (update) {
          obj.update = function(from, to, text, origin) {
            if (from) {
              obj.from = clipPos(doc, from);
            }
            if (to) {
              obj.to = clipPos(doc, to);
            }
            if (text) {
              obj.text = text;
            }
            if (origin !== undefined) {
              obj.origin = origin;
            }
          };
        }
        signal(doc, "beforeChange", doc, obj);
        if (doc.cm) {
          signal(doc.cm, "beforeChange", doc.cm, obj);
        }

        if (obj.canceled) {
          return null
        }
        return {
          from: obj.from,
          to: obj.to,
          text: obj.text,
          origin: obj.origin
        }
      }

      // Apply a change to a document, and add it to the document's
      // history, and propagating it to all linked documents.
      function makeChange(doc, change, ignoreReadOnly) {
        if (doc.cm) {
          if (!doc.cm.curOp) {
            return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly)
          }
          if (doc.cm.state.suppressEdits) {
            return
          }
        }

        if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
          change = filterChange(doc, change, true);
          if (!change) {
            return
          }
        }

        // Possibly split or suppress the update based on the presence
        // of read-only spans in its range.
        var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
        if (split) {
          for (var i = split.length - 1; i >= 0; --i) {
            makeChangeInner(doc, {
              from: split[i].from,
              to: split[i].to,
              text: i ? [""] : change.text,
              origin: change.origin
            });
          }
        } else {
          makeChangeInner(doc, change);
        }
      }

      function makeChangeInner(doc, change) {
        if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) {
          return
        }
        var selAfter = computeSelAfterChange(doc, change);
        addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);

        makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
        var rebased = [];

        linkedDocs(doc, function(doc, sharedHist) {
          if (!sharedHist && indexOf(rebased, doc.history) == -1) {
            rebaseHist(doc.history, change);
            rebased.push(doc.history);
          }
          makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
        });
      }

      // Revert a change stored in a document's history.
      function makeChangeFromHistory(doc, type, allowSelectionOnly) {
        var suppress = doc.cm && doc.cm.state.suppressEdits;
        if (suppress && !allowSelectionOnly) {
          return
        }

        var hist = doc.history,
          event, selAfter = doc.sel;
        var source = type == "undo" ? hist.done : hist.undone,
          dest = type == "undo" ? hist.undone : hist.done;

        // Verify that there is a useable event (so that ctrl-z won't
        // needlessly clear selection events)
        var i = 0;
        for (; i < source.length; i++) {
          event = source[i];
          if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges) {
            break
          }
        }
        if (i == source.length) {
          return
        }
        hist.lastOrigin = hist.lastSelOrigin = null;

        for (;;) {
          event = source.pop();
          if (event.ranges) {
            pushSelectionToHistory(event, dest);
            if (allowSelectionOnly && !event.equals(doc.sel)) {
              setSelection(doc, event, {
                clearRedo: false
              });
              return
            }
            selAfter = event;
          } else if (suppress) {
            source.push(event);
            return
          } else {
            break
          }
        }

        // Build up a reverse change object to add to the opposite history
        // stack (redo when undoing, and vice versa).
        var antiChanges = [];
        pushSelectionToHistory(selAfter, dest);
        dest.push({
          changes: antiChanges,
          generation: hist.generation
        });
        hist.generation = event.generation || ++hist.maxGeneration;

        var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");

        var loop = function(i) {
          var change = event.changes[i];
          change.origin = type;
          if (filter && !filterChange(doc, change, false)) {
            source.length = 0;
            return {}
          }

          antiChanges.push(historyChangeFromChange(doc, change));

          var after = i ? computeSelAfterChange(doc, change) : lst(source);
          makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
          if (!i && doc.cm) {
            doc.cm.scrollIntoView({
              from: change.from,
              to: changeEnd(change)
            });
          }
          var rebased = [];

          // Propagate to the linked documents
          linkedDocs(doc, function(doc, sharedHist) {
            if (!sharedHist && indexOf(rebased, doc.history) == -1) {
              rebaseHist(doc.history, change);
              rebased.push(doc.history);
            }
            makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
          });
        };

        for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {
          var returned = loop(i$1);

          if (returned) return returned.v;
        }
      }

      // Sub-views need their line numbers shifted when text is added
      // above or below them in the parent document.
      function shiftDoc(doc, distance) {
        if (distance == 0) {
          return
        }
        doc.first += distance;
        doc.sel = new Selection(map(doc.sel.ranges, function(range) {
          return new Range(
            Pos(range.anchor.line + distance, range.anchor.ch),
            Pos(range.head.line + distance, range.head.ch)
          );
        }), doc.sel.primIndex);
        if (doc.cm) {
          regChange(doc.cm, doc.first, doc.first - distance, distance);
          for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++) {
            regLineChange(doc.cm, l, "gutter");
          }
        }
      }

      // More lower-level change function, handling only a single document
      // (not linked ones).
      function makeChangeSingleDoc(doc, change, selAfter, spans) {
        if (doc.cm && !doc.cm.curOp) {
          return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans)
        }

        if (change.to.line < doc.first) {
          shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
          return
        }
        if (change.from.line > doc.lastLine()) {
          return
        }

        // Clip the change to the size of this doc
        if (change.from.line < doc.first) {
          var shift = change.text.length - 1 - (doc.first - change.from.line);
          shiftDoc(doc, shift);
          change = {
            from: Pos(doc.first, 0),
            to: Pos(change.to.line + shift, change.to.ch),
            text: [lst(change.text)],
            origin: change.origin
          };
        }
        var last = doc.lastLine();
        if (change.to.line > last) {
          change = {
            from: change.from,
            to: Pos(last, getLine(doc, last).text.length),
            text: [change.text[0]],
            origin: change.origin
          };
        }

        change.removed = getBetween(doc, change.from, change.to);

        if (!selAfter) {
          selAfter = computeSelAfterChange(doc, change);
        }
        if (doc.cm) {
          makeChangeSingleDocInEditor(doc.cm, change, spans);
        } else {
          updateDoc(doc, change, spans);
        }
        setSelectionNoUndo(doc, selAfter, sel_dontScroll);
      }

      // Handle the interaction of a change to a document with the editor
      // that this document is part of.
      function makeChangeSingleDocInEditor(cm, change, spans) {
        var doc = cm.doc,
          display = cm.display,
          from = change.from,
          to = change.to;

        var recomputeMaxLength = false,
          checkWidthStart = from.line;
        if (!cm.options.lineWrapping) {
          checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
          doc.iter(checkWidthStart, to.line + 1, function(line) {
            if (line == display.maxLine) {
              recomputeMaxLength = true;
              return true
            }
          });
        }

        if (doc.sel.contains(change.from, change.to) > -1) {
          signalCursorActivity(cm);
        }

        updateDoc(doc, change, spans, estimateHeight(cm));

        if (!cm.options.lineWrapping) {
          doc.iter(checkWidthStart, from.line + change.text.length, function(line) {
            var len = lineLength(line);
            if (len > display.maxLineLength) {
              display.maxLine = line;
              display.maxLineLength = len;
              display.maxLineChanged = true;
              recomputeMaxLength = false;
            }
          });
          if (recomputeMaxLength) {
            cm.curOp.updateMaxLine = true;
          }
        }

        retreatFrontier(doc, from.line);
        startWorker(cm, 400);

        var lendiff = change.text.length - (to.line - from.line) - 1;
        // Remember that these lines changed, for updating the display
        if (change.full) {
          regChange(cm);
        } else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change)) {
          regLineChange(cm, from.line, "text");
        } else {
          regChange(cm, from.line, to.line + 1, lendiff);
        }

        var changesHandler = hasHandler(cm, "changes"),
          changeHandler = hasHandler(cm, "change");
        if (changeHandler || changesHandler) {
          var obj = {
            from: from,
            to: to,
            text: change.text,
            removed: change.removed,
            origin: change.origin
          };
          if (changeHandler) {
            signalLater(cm, "change", cm, obj);
          }
          if (changesHandler) {
            (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj);
          }
        }
        cm.display.selForContextMenu = null;
      }

      function replaceRange(doc, code, from, to, origin) {
        if (!to) {
          to = from;
        }
        if (cmp(to, from) < 0) {
          var assign;
          (assign = [to, from], from = assign[0], to = assign[1], assign);
        }
        if (typeof code == "string") {
          code = doc.splitLines(code);
        }
        makeChange(doc, {
          from: from,
          to: to,
          text: code,
          origin: origin
        });
      }

      // Rebasing/resetting history to deal with externally-sourced changes

      function rebaseHistSelSingle(pos, from, to, diff) {
        if (to < pos.line) {
          pos.line += diff;
        } else if (from < pos.line) {
          pos.line = from;
          pos.ch = 0;
        }
      }

      // Tries to rebase an array of history events given a change in the
      // document. If the change touches the same lines as the event, the
      // event, and everything 'behind' it, is discarded. If the change is
      // before the event, the event's positions are updated. Uses a
      // copy-on-write scheme for the positions, to avoid having to
      // reallocate them all on every rebase, but also avoid problems with
      // shared position objects being unsafely updated.
      function rebaseHistArray(array, from, to, diff) {
        for (var i = 0; i < array.length; ++i) {
          var sub = array[i],
            ok = true;
          if (sub.ranges) {
            if (!sub.copied) {
              sub = array[i] = sub.deepCopy();
              sub.copied = true;
            }
            for (var j = 0; j < sub.ranges.length; j++) {
              rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
              rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
            }
            continue
          }
          for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {
            var cur = sub.changes[j$1];
            if (to < cur.from.line) {
              cur.from = Pos(cur.from.line + diff, cur.from.ch);
              cur.to = Pos(cur.to.line + diff, cur.to.ch);
            } else if (from <= cur.to.line) {
              ok = false;
              break
            }
          }
          if (!ok) {
            array.splice(0, i + 1);
            i = 0;
          }
        }
      }

      function rebaseHist(hist, change) {
        var from = change.from.line,
          to = change.to.line,
          diff = change.text.length - (to - from) - 1;
        rebaseHistArray(hist.done, from, to, diff);
        rebaseHistArray(hist.undone, from, to, diff);
      }

      // Utility for applying a change to a line by handle or number,
      // returning the number and optionally registering the line as
      // changed.
      function changeLine(doc, handle, changeType, op) {
        var no = handle,
          line = handle;
        if (typeof handle == "number") {
          line = getLine(doc, clipLine(doc, handle));
        } else {
          no = lineNo(handle);
        }
        if (no == null) {
          return null
        }
        if (op(line, no) && doc.cm) {
          regLineChange(doc.cm, no, changeType);
        }
        return line
      }

      // The document is represented as a BTree consisting of leaves, with
      // chunk of lines in them, and branches, with up to ten leaves or
      // other branch nodes below them. The top node is always a branch
      // node, and is the document object itself (meaning it has
      // additional methods and properties).
      //
      // All nodes have parent links. The tree is used both to go from
      // line numbers to line objects, and to go from objects to numbers.
      // It also indexes by height, and is used to convert between height
      // and line object, and to find the total height of the document.
      //
      // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html

      function LeafChunk(lines) {
        var this$1 = this;

        this.lines = lines;
        this.parent = null;
        var height = 0;
        for (var i = 0; i < lines.length; ++i) {
          lines[i].parent = this$1;
          height += lines[i].height;
        }
        this.height = height;
      }

      LeafChunk.prototype = {
        chunkSize: function chunkSize() {
          return this.lines.length
        },

        // Remove the n lines at offset 'at'.
        removeInner: function removeInner(at, n) {
          var this$1 = this;

          for (var i = at, e = at + n; i < e; ++i) {
            var line = this$1.lines[i];
            this$1.height -= line.height;
            cleanUpLine(line);
            signalLater(line, "delete");
          }
          this.lines.splice(at, n);
        },

        // Helper used to collapse a small branch into a single leaf.
        collapse: function collapse(lines) {
          lines.push.apply(lines, this.lines);
        },

        // Insert the given array of lines at offset 'at', count them as
        // having the given height.
        insertInner: function insertInner(at, lines, height) {
          var this$1 = this;

          this.height += height;
          this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
          for (var i = 0; i < lines.length; ++i) {
            lines[i].parent = this$1;
          }
        },

        // Used to iterate over a part of the tree.
        iterN: function iterN(at, n, op) {
          var this$1 = this;

          for (var e = at + n; at < e; ++at) {
            if (op(this$1.lines[at])) {
              return true
            }
          }
        }
      };

      function BranchChunk(children) {
        var this$1 = this;

        this.children = children;
        var size = 0,
          height = 0;
        for (var i = 0; i < children.length; ++i) {
          var ch = children[i];
          size += ch.chunkSize();
          height += ch.height;
          ch.parent = this$1;
        }
        this.size = size;
        this.height = height;
        this.parent = null;
      }

      BranchChunk.prototype = {
        chunkSize: function chunkSize() {
          return this.size
        },

        removeInner: function removeInner(at, n) {
          var this$1 = this;

          this.size -= n;
          for (var i = 0; i < this.children.length; ++i) {
            var child = this$1.children[i],
              sz = child.chunkSize();
            if (at < sz) {
              var rm = Math.min(n, sz - at),
                oldHeight = child.height;
              child.removeInner(at, rm);
              this$1.height -= oldHeight - child.height;
              if (sz == rm) {
                this$1.children.splice(i--, 1);
                child.parent = null;
              }
              if ((n -= rm) == 0) {
                break
              }
              at = 0;
            } else {
              at -= sz;
            }
          }
          // If the result is smaller than 25 lines, ensure that it is a
          // single leaf node.
          if (this.size - n < 25 &&
            (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
            var lines = [];
            this.collapse(lines);
            this.children = [new LeafChunk(lines)];
            this.children[0].parent = this;
          }
        },

        collapse: function collapse(lines) {
          var this$1 = this;

          for (var i = 0; i < this.children.length; ++i) {
            this$1.children[i].collapse(lines);
          }
        },

        insertInner: function insertInner(at, lines, height) {
          var this$1 = this;

          this.size += lines.length;
          this.height += height;
          for (var i = 0; i < this.children.length; ++i) {
            var child = this$1.children[i],
              sz = child.chunkSize();
            if (at <= sz) {
              child.insertInner(at, lines, height);
              if (child.lines && child.lines.length > 50) {
                // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
                // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
                var remaining = child.lines.length % 25 + 25;
                for (var pos = remaining; pos < child.lines.length;) {
                  var leaf = new LeafChunk(child.lines.slice(pos, pos += 25));
                  child.height -= leaf.height;
                  this$1.children.splice(++i, 0, leaf);
                  leaf.parent = this$1;
                }
                child.lines = child.lines.slice(0, remaining);
                this$1.maybeSpill();
              }
              break
            }
            at -= sz;
          }
        },

        // When a node has grown, check whether it should be split.
        maybeSpill: function maybeSpill() {
          if (this.children.length <= 10) {
            return
          }
          var me = this;
          do {
            var spilled = me.children.splice(me.children.length - 5, 5);
            var sibling = new BranchChunk(spilled);
            if (!me.parent) { // Become the parent node
              var copy = new BranchChunk(me.children);
              copy.parent = me;
              me.children = [copy, sibling];
              me = copy;
            } else {
              me.size -= sibling.size;
              me.height -= sibling.height;
              var myIndex = indexOf(me.parent.children, me);
              me.parent.children.splice(myIndex + 1, 0, sibling);
            }
            sibling.parent = me.parent;
          } while (me.children.length > 10)
          me.parent.maybeSpill();
        },

        iterN: function iterN(at, n, op) {
          var this$1 = this;

          for (var i = 0; i < this.children.length; ++i) {
            var child = this$1.children[i],
              sz = child.chunkSize();
            if (at < sz) {
              var used = Math.min(n, sz - at);
              if (child.iterN(at, used, op)) {
                return true
              }
              if ((n -= used) == 0) {
                break
              }
              at = 0;
            } else {
              at -= sz;
            }
          }
        }
      };

      // Line widgets are block elements displayed above or below a line.

      var LineWidget = function(doc, node, options) {
        var this$1 = this;

        if (options) {
          for (var opt in options) {
            if (options.hasOwnProperty(opt)) {
              this$1[opt] = options[opt];
            }
          }
        }
        this.doc = doc;
        this.node = node;
      };

      LineWidget.prototype.clear = function() {
        var this$1 = this;

        var cm = this.doc.cm,
          ws = this.line.widgets,
          line = this.line,
          no = lineNo(line);
        if (no == null || !ws) {
          return
        }
        for (var i = 0; i < ws.length; ++i) {
          if (ws[i] == this$1) {
            ws.splice(i--, 1);
          }
        }
        if (!ws.length) {
          line.widgets = null;
        }
        var height = widgetHeight(this);
        updateLineHeight(line, Math.max(0, line.height - height));
        if (cm) {
          runInOp(cm, function() {
            adjustScrollWhenAboveVisible(cm, line, -height);
            regLineChange(cm, no, "widget");
          });
          signalLater(cm, "lineWidgetCleared", cm, this, no);
        }
      };

      LineWidget.prototype.changed = function() {
        var this$1 = this;

        var oldH = this.height,
          cm = this.doc.cm,
          line = this.line;
        this.height = null;
        var diff = widgetHeight(this) - oldH;
        if (!diff) {
          return
        }
        updateLineHeight(line, line.height + diff);
        if (cm) {
          runInOp(cm, function() {
            cm.curOp.forceUpdate = true;
            adjustScrollWhenAboveVisible(cm, line, diff);
            signalLater(cm, "lineWidgetChanged", cm, this$1, lineNo(line));
          });
        }
      };
      eventMixin(LineWidget);

      function adjustScrollWhenAboveVisible(cm, line, diff) {
        if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop)) {
          addToScrollTop(cm, diff);
        }
      }

      function addLineWidget(doc, handle, node, options) {
        var widget = new LineWidget(doc, node, options);
        var cm = doc.cm;
        if (cm && widget.noHScroll) {
          cm.display.alignWidgets = true;
        }
        changeLine(doc, handle, "widget", function(line) {
          var widgets = line.widgets || (line.widgets = []);
          if (widget.insertAt == null) {
            widgets.push(widget);
          } else {
            widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget);
          }
          widget.line = line;
          if (cm && !lineIsHidden(doc, line)) {
            var aboveVisible = heightAtLine(line) < doc.scrollTop;
            updateLineHeight(line, line.height + widgetHeight(widget));
            if (aboveVisible) {
              addToScrollTop(cm, widget.height);
            }
            cm.curOp.forceUpdate = true;
          }
          return true
        });
        if (cm) {
          signalLater(cm, "lineWidgetAdded", cm, widget, typeof handle == "number" ? handle : lineNo(handle));
        }
        return widget
      }

      // TEXTMARKERS

      // Created with markText and setBookmark methods. A TextMarker is a
      // handle that can be used to clear or find a marked position in the
      // document. Line objects hold arrays (markedSpans) containing
      // {from, to, marker} object pointing to such marker objects, and
      // indicating that such a marker is present on that line. Multiple
      // lines may point to the same marker when it spans across lines.
      // The spans will have null for their from/to properties when the
      // marker continues beyond the start/end of the line. Markers have
      // links back to the lines they currently touch.

      // Collapsed markers have unique ids, in order to be able to order
      // them, which is needed for uniquely determining an outer marker
      // when they overlap (they may nest, but not partially overlap).
      var nextMarkerId = 0;

      var TextMarker = function(doc, type) {
        this.lines = [];
        this.type = type;
        this.doc = doc;
        this.id = ++nextMarkerId;
      };

      // Clear the marker.
      TextMarker.prototype.clear = function() {
        var this$1 = this;

        if (this.explicitlyCleared) {
          return
        }
        var cm = this.doc.cm,
          withOp = cm && !cm.curOp;
        if (withOp) {
          startOperation(cm);
        }
        if (hasHandler(this, "clear")) {
          var found = this.find();
          if (found) {
            signalLater(this, "clear", found.from, found.to);
          }
        }
        var min = null,
          max = null;
        for (var i = 0; i < this.lines.length; ++i) {
          var line = this$1.lines[i];
          var span = getMarkedSpanFor(line.markedSpans, this$1);
          if (cm && !this$1.collapsed) {
            regLineChange(cm, lineNo(line), "text");
          } else if (cm) {
            if (span.to != null) {
              max = lineNo(line);
            }
            if (span.from != null) {
              min = lineNo(line);
            }
          }
          line.markedSpans = removeMarkedSpan(line.markedSpans, span);
          if (span.from == null && this$1.collapsed && !lineIsHidden(this$1.doc, line) && cm) {
            updateLineHeight(line, textHeight(cm.display));
          }
        }
        if (cm && this.collapsed && !cm.options.lineWrapping) {
          for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {
            var visual = visualLine(this$1.lines[i$1]),
              len = lineLength(visual);
            if (len > cm.display.maxLineLength) {
              cm.display.maxLine = visual;
              cm.display.maxLineLength = len;
              cm.display.maxLineChanged = true;
            }
          }
        }

        if (min != null && cm && this.collapsed) {
          regChange(cm, min, max + 1);
        }
        this.lines.length = 0;
        this.explicitlyCleared = true;
        if (this.atomic && this.doc.cantEdit) {
          this.doc.cantEdit = false;
          if (cm) {
            reCheckSelection(cm.doc);
          }
        }
        if (cm) {
          signalLater(cm, "markerCleared", cm, this, min, max);
        }
        if (withOp) {
          endOperation(cm);
        }
        if (this.parent) {
          this.parent.clear();
        }
      };

      // Find the position of the marker in the document. Returns a {from,
      // to} object by default. Side can be passed to get a specific side
      // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
      // Pos objects returned contain a line object, rather than a line
      // number (used to prevent looking up the same line twice).
      TextMarker.prototype.find = function(side, lineObj) {
        var this$1 = this;

        if (side == null && this.type == "bookmark") {
          side = 1;
        }
        var from, to;
        for (var i = 0; i < this.lines.length; ++i) {
          var line = this$1.lines[i];
          var span = getMarkedSpanFor(line.markedSpans, this$1);
          if (span.from != null) {
            from = Pos(lineObj ? line : lineNo(line), span.from);
            if (side == -1) {
              return from
            }
          }
          if (span.to != null) {
            to = Pos(lineObj ? line : lineNo(line), span.to);
            if (side == 1) {
              return to
            }
          }
        }
        return from && {
          from: from,
          to: to
        }
      };

      // Signals that the marker's widget changed, and surrounding layout
      // should be recomputed.
      TextMarker.prototype.changed = function() {
        var this$1 = this;

        var pos = this.find(-1, true),
          widget = this,
          cm = this.doc.cm;
        if (!pos || !cm) {
          return
        }
        runInOp(cm, function() {
          var line = pos.line,
            lineN = lineNo(pos.line);
          var view = findViewForLine(cm, lineN);
          if (view) {
            clearLineMeasurementCacheFor(view);
            cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
          }
          cm.curOp.updateMaxLine = true;
          if (!lineIsHidden(widget.doc, line) && widget.height != null) {
            var oldHeight = widget.height;
            widget.height = null;
            var dHeight = widgetHeight(widget) - oldHeight;
            if (dHeight) {
              updateLineHeight(line, line.height + dHeight);
            }
          }
          signalLater(cm, "markerChanged", cm, this$1);
        });
      };

      TextMarker.prototype.attachLine = function(line) {
        if (!this.lines.length && this.doc.cm) {
          var op = this.doc.cm.curOp;
          if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1) {
            (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this);
          }
        }
        this.lines.push(line);
      };

      TextMarker.prototype.detachLine = function(line) {
        this.lines.splice(indexOf(this.lines, line), 1);
        if (!this.lines.length && this.doc.cm) {
          var op = this.doc.cm.curOp;
          (op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
        }
      };
      eventMixin(TextMarker);

      // Create a marker, wire it up to the right lines, and
      function markText(doc, from, to, options, type) {
        // Shared markers (across linked documents) are handled separately
        // (markTextShared will call out to this again, once per
        // document).
        if (options && options.shared) {
          return markTextShared(doc, from, to, options, type)
        }
        // Ensure we are in an operation.
        if (doc.cm && !doc.cm.curOp) {
          return operation(doc.cm, markText)(doc, from, to, options, type)
        }

        var marker = new TextMarker(doc, type),
          diff = cmp(from, to);
        if (options) {
          copyObj(options, marker, false);
        }
        // Don't connect empty markers unless clearWhenEmpty is false
        if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false) {
          return marker
        }
        if (marker.replacedWith) {
          // Showing up as a widget implies collapsed (widget replaces text)
          marker.collapsed = true;
          marker.widgetNode = eltP("span", [marker.replacedWith], "CodeMirror-widget");
          if (!options.handleMouseEvents) {
            marker.widgetNode.setAttribute("cm-ignore-events", "true");
          }
          if (options.insertLeft) {
            marker.widgetNode.insertLeft = true;
          }
        }
        if (marker.collapsed) {
          if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
            from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker)) {
            throw new Error("Inserting collapsed marker partially overlapping an existing one")
          }
          seeCollapsedSpans();
        }

        if (marker.addToHistory) {
          addChangeToHistory(doc, {
            from: from,
            to: to,
            origin: "markText"
          }, doc.sel, NaN);
        }

        var curLine = from.line,
          cm = doc.cm,
          updateMaxLine;
        doc.iter(curLine, to.line + 1, function(line) {
          if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine) {
            updateMaxLine = true;
          }
          if (marker.collapsed && curLine != from.line) {
            updateLineHeight(line, 0);
          }
          addMarkedSpan(line, new MarkedSpan(marker,
            curLine == from.line ? from.ch : null,
            curLine == to.line ? to.ch : null));
          ++curLine;
        });
        // lineIsHidden depends on the presence of the spans, so needs a second pass
        if (marker.collapsed) {
          doc.iter(from.line, to.line + 1, function(line) {
            if (lineIsHidden(doc, line)) {
              updateLineHeight(line, 0);
            }
          });
        }

        if (marker.clearOnEnter) {
          on(marker, "beforeCursorEnter", function() {
            return marker.clear();
          });
        }

        if (marker.readOnly) {
          seeReadOnlySpans();
          if (doc.history.done.length || doc.history.undone.length) {
            doc.clearHistory();
          }
        }
        if (marker.collapsed) {
          marker.id = ++nextMarkerId;
          marker.atomic = true;
        }
        if (cm) {
          // Sync editor state
          if (updateMaxLine) {
            cm.curOp.updateMaxLine = true;
          }
          if (marker.collapsed) {
            regChange(cm, from.line, to.line + 1);
          } else if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.css) {
            for (var i = from.line; i <= to.line; i++) {
              regLineChange(cm, i, "text");
            }
          }
          if (marker.atomic) {
            reCheckSelection(cm.doc);
          }
          signalLater(cm, "markerAdded", cm, marker);
        }
        return marker
      }

      // SHARED TEXTMARKERS

      // A shared marker spans multiple linked documents. It is
      // implemented as a meta-marker-object controlling multiple normal
      // markers.
      var SharedTextMarker = function(markers, primary) {
        var this$1 = this;

        this.markers = markers;
        this.primary = primary;
        for (var i = 0; i < markers.length; ++i) {
          markers[i].parent = this$1;
        }
      };

      SharedTextMarker.prototype.clear = function() {
        var this$1 = this;

        if (this.explicitlyCleared) {
          return
        }
        this.explicitlyCleared = true;
        for (var i = 0; i < this.markers.length; ++i) {
          this$1.markers[i].clear();
        }
        signalLater(this, "clear");
      };

      SharedTextMarker.prototype.find = function(side, lineObj) {
        return this.primary.find(side, lineObj)
      };
      eventMixin(SharedTextMarker);

      function markTextShared(doc, from, to, options, type) {
        options = copyObj(options);
        options.shared = false;
        var markers = [markText(doc, from, to, options, type)],
          primary = markers[0];
        var widget = options.widgetNode;
        linkedDocs(doc, function(doc) {
          if (widget) {
            options.widgetNode = widget.cloneNode(true);
          }
          markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
          for (var i = 0; i < doc.linked.length; ++i) {
            if (doc.linked[i].isParent) {
              return
            }
          }
          primary = lst(markers);
        });
        return new SharedTextMarker(markers, primary)
      }

      function findSharedMarkers(doc) {
        return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function(m) {
          return m.parent;
        })
      }

      function copySharedMarkers(doc, markers) {
        for (var i = 0; i < markers.length; i++) {
          var marker = markers[i],
            pos = marker.find();
          var mFrom = doc.clipPos(pos.from),
            mTo = doc.clipPos(pos.to);
          if (cmp(mFrom, mTo)) {
            var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);
            marker.markers.push(subMark);
            subMark.parent = marker;
          }
        }
      }

      function detachSharedMarkers(markers) {
        var loop = function(i) {
          var marker = markers[i],
            linked = [marker.primary.doc];
          linkedDocs(marker.primary.doc, function(d) {
            return linked.push(d);
          });
          for (var j = 0; j < marker.markers.length; j++) {
            var subMarker = marker.markers[j];
            if (indexOf(linked, subMarker.doc) == -1) {
              subMarker.parent = null;
              marker.markers.splice(j--, 1);
            }
          }
        };

        for (var i = 0; i < markers.length; i++) loop(i);
      }

      var nextDocId = 0;
      var Doc = function(text, mode, firstLine, lineSep, direction) {
        if (!(this instanceof Doc)) {
          return new Doc(text, mode, firstLine, lineSep, direction)
        }
        if (firstLine == null) {
          firstLine = 0;
        }

        BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
        this.first = firstLine;
        this.scrollTop = this.scrollLeft = 0;
        this.cantEdit = false;
        this.cleanGeneration = 1;
        this.modeFrontier = this.highlightFrontier = firstLine;
        var start = Pos(firstLine, 0);
        this.sel = simpleSelection(start);
        this.history = new History(null);
        this.id = ++nextDocId;
        this.modeOption = mode;
        this.lineSep = lineSep;
        this.direction = (direction == "rtl") ? "rtl" : "ltr";
        this.extend = false;

        if (typeof text == "string") {
          text = this.splitLines(text);
        }
        updateDoc(this, {
          from: start,
          to: start,
          text: text
        });
        setSelection(this, simpleSelection(start), sel_dontScroll);
      };

      Doc.prototype = createObj(BranchChunk.prototype, {
        constructor: Doc,
        // Iterate over the document. Supports two forms -- with only one
        // argument, it calls that for each line in the document. With
        // three, it iterates over the range given by the first two (with
        // the second being non-inclusive).
        iter: function(from, to, op) {
          if (op) {
            this.iterN(from - this.first, to - from, op);
          } else {
            this.iterN(this.first, this.first + this.size, from);
          }
        },

        // Non-public interface for adding and removing lines.
        insert: function(at, lines) {
          var height = 0;
          for (var i = 0; i < lines.length; ++i) {
            height += lines[i].height;
          }
          this.insertInner(at - this.first, lines, height);
        },
        remove: function(at, n) {
          this.removeInner(at - this.first, n);
        },

        // From here, the methods are part of the public interface. Most
        // are also available from CodeMirror (editor) instances.

        getValue: function(lineSep) {
          var lines = getLines(this, this.first, this.first + this.size);
          if (lineSep === false) {
            return lines
          }
          return lines.join(lineSep || this.lineSeparator())
        },
        setValue: docMethodOp(function(code) {
          var top = Pos(this.first, 0),
            last = this.first + this.size - 1;
          makeChange(this, {
            from: top,
            to: Pos(last, getLine(this, last).text.length),
            text: this.splitLines(code),
            origin: "setValue",
            full: true
          }, true);
          if (this.cm) {
            scrollToCoords(this.cm, 0, 0);
          }
          setSelection(this, simpleSelection(top), sel_dontScroll);
        }),
        replaceRange: function(code, from, to, origin) {
          from = clipPos(this, from);
          to = to ? clipPos(this, to) : from;
          replaceRange(this, code, from, to, origin);
        },
        getRange: function(from, to, lineSep) {
          var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
          if (lineSep === false) {
            return lines
          }
          return lines.join(lineSep || this.lineSeparator())
        },

        getLine: function(line) {
          var l = this.getLineHandle(line);
          return l && l.text
        },

        getLineHandle: function(line) {
          if (isLine(this, line)) {
            return getLine(this, line)
          }
        },
        getLineNumber: function(line) {
          return lineNo(line)
        },

        getLineHandleVisualStart: function(line) {
          if (typeof line == "number") {
            line = getLine(this, line);
          }
          return visualLine(line)
        },

        lineCount: function() {
          return this.size
        },
        firstLine: function() {
          return this.first
        },
        lastLine: function() {
          return this.first + this.size - 1
        },

        clipPos: function(pos) {
          return clipPos(this, pos)
        },

        getCursor: function(start) {
          var range$$1 = this.sel.primary(),
            pos;
          if (start == null || start == "head") {
            pos = range$$1.head;
          } else if (start == "anchor") {
            pos = range$$1.anchor;
          } else if (start == "end" || start == "to" || start === false) {
            pos = range$$1.to();
          } else {
            pos = range$$1.from();
          }
          return pos
        },
        listSelections: function() {
          return this.sel.ranges
        },
        somethingSelected: function() {
          return this.sel.somethingSelected()
        },

        setCursor: docMethodOp(function(line, ch, options) {
          setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options);
        }),
        setSelection: docMethodOp(function(anchor, head, options) {
          setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
        }),
        extendSelection: docMethodOp(function(head, other, options) {
          extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
        }),
        extendSelections: docMethodOp(function(heads, options) {
          extendSelections(this, clipPosArray(this, heads), options);
        }),
        extendSelectionsBy: docMethodOp(function(f, options) {
          var heads = map(this.sel.ranges, f);
          extendSelections(this, clipPosArray(this, heads), options);
        }),
        setSelections: docMethodOp(function(ranges, primary, options) {
          var this$1 = this;

          if (!ranges.length) {
            return
          }
          var out = [];
          for (var i = 0; i < ranges.length; i++) {
            out[i] = new Range(clipPos(this$1, ranges[i].anchor),
              clipPos(this$1, ranges[i].head));
          }
          if (primary == null) {
            primary = Math.min(ranges.length - 1, this.sel.primIndex);
          }
          setSelection(this, normalizeSelection(out, primary), options);
        }),
        addSelection: docMethodOp(function(anchor, head, options) {
          var ranges = this.sel.ranges.slice(0);
          ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
          setSelection(this, normalizeSelection(ranges, ranges.length - 1), options);
        }),

        getSelection: function(lineSep) {
          var this$1 = this;

          var ranges = this.sel.ranges,
            lines;
          for (var i = 0; i < ranges.length; i++) {
            var sel = getBetween(this$1, ranges[i].from(), ranges[i].to());
            lines = lines ? lines.concat(sel) : sel;
          }
          if (lineSep === false) {
            return lines
          } else {
            return lines.join(lineSep || this.lineSeparator())
          }
        },
        getSelections: function(lineSep) {
          var this$1 = this;

          var parts = [],
            ranges = this.sel.ranges;
          for (var i = 0; i < ranges.length; i++) {
            var sel = getBetween(this$1, ranges[i].from(), ranges[i].to());
            if (lineSep !== false) {
              sel = sel.join(lineSep || this$1.lineSeparator());
            }
            parts[i] = sel;
          }
          return parts
        },
        replaceSelection: function(code, collapse, origin) {
          var dup = [];
          for (var i = 0; i < this.sel.ranges.length; i++) {
            dup[i] = code;
          }
          this.replaceSelections(dup, collapse, origin || "+input");
        },
        replaceSelections: docMethodOp(function(code, collapse, origin) {
          var this$1 = this;

          var changes = [],
            sel = this.sel;
          for (var i = 0; i < sel.ranges.length; i++) {
            var range$$1 = sel.ranges[i];
            changes[i] = {
              from: range$$1.from(),
              to: range$$1.to(),
              text: this$1.splitLines(code[i]),
              origin: origin
            };
          }
          var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
          for (var i$1 = changes.length - 1; i$1 >= 0; i$1--) {
            makeChange(this$1, changes[i$1]);
          }
          if (newSel) {
            setSelectionReplaceHistory(this, newSel);
          } else if (this.cm) {
            ensureCursorVisible(this.cm);
          }
        }),
        undo: docMethodOp(function() {
          makeChangeFromHistory(this, "undo");
        }),
        redo: docMethodOp(function() {
          makeChangeFromHistory(this, "redo");
        }),
        undoSelection: docMethodOp(function() {
          makeChangeFromHistory(this, "undo", true);
        }),
        redoSelection: docMethodOp(function() {
          makeChangeFromHistory(this, "redo", true);
        }),

        setExtending: function(val) {
          this.extend = val;
        },
        getExtending: function() {
          return this.extend
        },

        historySize: function() {
          var hist = this.history,
            done = 0,
            undone = 0;
          for (var i = 0; i < hist.done.length; i++) {
            if (!hist.done[i].ranges) {
              ++done;
            }
          }
          for (var i$1 = 0; i$1 < hist.undone.length; i$1++) {
            if (!hist.undone[i$1].ranges) {
              ++undone;
            }
          }
          return {
            undo: done,
            redo: undone
          }
        },
        clearHistory: function() {
          this.history = new History(this.history.maxGeneration);
        },

        markClean: function() {
          this.cleanGeneration = this.changeGeneration(true);
        },
        changeGeneration: function(forceSplit) {
          if (forceSplit) {
            this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null;
          }
          return this.history.generation
        },
        isClean: function(gen) {
          return this.history.generation == (gen || this.cleanGeneration)
        },

        getHistory: function() {
          return {
            done: copyHistoryArray(this.history.done),
            undone: copyHistoryArray(this.history.undone)
          }
        },
        setHistory: function(histData) {
          var hist = this.history = new History(this.history.maxGeneration);
          hist.done = copyHistoryArray(histData.done.slice(0), null, true);
          hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
        },

        setGutterMarker: docMethodOp(function(line, gutterID, value) {
          return changeLine(this, line, "gutter", function(line) {
            var markers = line.gutterMarkers || (line.gutterMarkers = {});
            markers[gutterID] = value;
            if (!value && isEmpty(markers)) {
              line.gutterMarkers = null;
            }
            return true
          })
        }),

        clearGutter: docMethodOp(function(gutterID) {
          var this$1 = this;

          this.iter(function(line) {
            if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
              changeLine(this$1, line, "gutter", function() {
                line.gutterMarkers[gutterID] = null;
                if (isEmpty(line.gutterMarkers)) {
                  line.gutterMarkers = null;
                }
                return true
              });
            }
          });
        }),

        lineInfo: function(line) {
          var n;
          if (typeof line == "number") {
            if (!isLine(this, line)) {
              return null
            }
            n = line;
            line = getLine(this, line);
            if (!line) {
              return null
            }
          } else {
            n = lineNo(line);
            if (n == null) {
              return null
            }
          }
          return {
            line: n,
            handle: line,
            text: line.text,
            gutterMarkers: line.gutterMarkers,
            textClass: line.textClass,
            bgClass: line.bgClass,
            wrapClass: line.wrapClass,
            widgets: line.widgets
          }
        },

        addLineClass: docMethodOp(function(handle, where, cls) {
          return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function(line) {
            var prop = where == "text" ? "textClass" :
              where == "background" ? "bgClass" :
              where == "gutter" ? "gutterClass" : "wrapClass";
            if (!line[prop]) {
              line[prop] = cls;
            } else if (classTest(cls).test(line[prop])) {
              return false
            } else {
              line[prop] += " " + cls;
            }
            return true
          })
        }),
        removeLineClass: docMethodOp(function(handle, where, cls) {
          return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function(line) {
            var prop = where == "text" ? "textClass" :
              where == "background" ? "bgClass" :
              where == "gutter" ? "gutterClass" : "wrapClass";
            var cur = line[prop];
            if (!cur) {
              return false
            } else if (cls == null) {
              line[prop] = null;
            } else {
              var found = cur.match(classTest(cls));
              if (!found) {
                return false
              }
              var end = found.index + found[0].length;
              line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
            }
            return true
          })
        }),

        addLineWidget: docMethodOp(function(handle, node, options) {
          return addLineWidget(this, handle, node, options)
        }),
        removeLineWidget: function(widget) {
          widget.clear();
        },

        markText: function(from, to, options) {
          return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range")
        },
        setBookmark: function(pos, options) {
          var realOpts = {
            replacedWith: options && (options.nodeType == null ? options.widget : options),
            insertLeft: options && options.insertLeft,
            clearWhenEmpty: false,
            shared: options && options.shared,
            handleMouseEvents: options && options.handleMouseEvents
          };
          pos = clipPos(this, pos);
          return markText(this, pos, pos, realOpts, "bookmark")
        },
        findMarksAt: function(pos) {
          pos = clipPos(this, pos);
          var markers = [],
            spans = getLine(this, pos.line).markedSpans;
          if (spans) {
            for (var i = 0; i < spans.length; ++i) {
              var span = spans[i];
              if ((span.from == null || span.from <= pos.ch) &&
                (span.to == null || span.to >= pos.ch)) {
                markers.push(span.marker.parent || span.marker);
              }
            }
          }
          return markers
        },
        findMarks: function(from, to, filter) {
          from = clipPos(this, from);
          to = clipPos(this, to);
          var found = [],
            lineNo$$1 = from.line;
          this.iter(from.line, to.line + 1, function(line) {
            var spans = line.markedSpans;
            if (spans) {
              for (var i = 0; i < spans.length; i++) {
                var span = spans[i];
                if (!(span.to != null && lineNo$$1 == from.line && from.ch >= span.to ||
                    span.from == null && lineNo$$1 != from.line ||
                    span.from != null && lineNo$$1 == to.line && span.from >= to.ch) &&
                  (!filter || filter(span.marker))) {
                  found.push(span.marker.parent || span.marker);
                }
              }
            }
            ++lineNo$$1;
          });
          return found
        },
        getAllMarks: function() {
          var markers = [];
          this.iter(function(line) {
            var sps = line.markedSpans;
            if (sps) {
              for (var i = 0; i < sps.length; ++i) {
                if (sps[i].from != null) {
                  markers.push(sps[i].marker);
                }
              }
            }
          });
          return markers
        },

        posFromIndex: function(off) {
          var ch, lineNo$$1 = this.first,
            sepSize = this.lineSeparator().length;
          this.iter(function(line) {
            var sz = line.text.length + sepSize;
            if (sz > off) {
              ch = off;
              return true
            }
            off -= sz;
            ++lineNo$$1;
          });
          return clipPos(this, Pos(lineNo$$1, ch))
        },
        indexFromPos: function(coords) {
          coords = clipPos(this, coords);
          var index = coords.ch;
          if (coords.line < this.first || coords.ch < 0) {
            return 0
          }
          var sepSize = this.lineSeparator().length;
          this.iter(this.first, coords.line, function(line) { // iter aborts when callback returns a truthy value
            index += line.text.length + sepSize;
          });
          return index
        },

        copy: function(copyHistory) {
          var doc = new Doc(getLines(this, this.first, this.first + this.size),
            this.modeOption, this.first, this.lineSep, this.direction);
          doc.scrollTop = this.scrollTop;
          doc.scrollLeft = this.scrollLeft;
          doc.sel = this.sel;
          doc.extend = false;
          if (copyHistory) {
            doc.history.undoDepth = this.history.undoDepth;
            doc.setHistory(this.getHistory());
          }
          return doc
        },

        linkedDoc: function(options) {
          if (!options) {
            options = {};
          }
          var from = this.first,
            to = this.first + this.size;
          if (options.from != null && options.from > from) {
            from = options.from;
          }
          if (options.to != null && options.to < to) {
            to = options.to;
          }
          var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction);
          if (options.sharedHist) {
            copy.history = this.history;
          }(this.linked || (this.linked = [])).push({
            doc: copy,
            sharedHist: options.sharedHist
          });
          copy.linked = [{
            doc: this,
            isParent: true,
            sharedHist: options.sharedHist
          }];
          copySharedMarkers(copy, findSharedMarkers(this));
          return copy
        },
        unlinkDoc: function(other) {
          var this$1 = this;

          if (other instanceof CodeMirror$1) {
            other = other.doc;
          }
          if (this.linked) {
            for (var i = 0; i < this.linked.length; ++i) {
              var link = this$1.linked[i];
              if (link.doc != other) {
                continue
              }
              this$1.linked.splice(i, 1);
              other.unlinkDoc(this$1);
              detachSharedMarkers(findSharedMarkers(this$1));
              break
            }
          }
          // If the histories were shared, split them again
          if (other.history == this.history) {
            var splitIds = [other.id];
            linkedDocs(other, function(doc) {
              return splitIds.push(doc.id);
            }, true);
            other.history = new History(null);
            other.history.done = copyHistoryArray(this.history.done, splitIds);
            other.history.undone = copyHistoryArray(this.history.undone, splitIds);
          }
        },
        iterLinkedDocs: function(f) {
          linkedDocs(this, f);
        },

        getMode: function() {
          return this.mode
        },
        getEditor: function() {
          return this.cm
        },

        splitLines: function(str) {
          if (this.lineSep) {
            return str.split(this.lineSep)
          }
          return splitLinesAuto(str)
        },
        lineSeparator: function() {
          return this.lineSep || "\n"
        },

        setDirection: docMethodOp(function(dir) {
          if (dir != "rtl") {
            dir = "ltr";
          }
          if (dir == this.direction) {
            return
          }
          this.direction = dir;
          this.iter(function(line) {
            return line.order = null;
          });
          if (this.cm) {
            directionChanged(this.cm);
          }
        })
      });

      // Public alias.
      Doc.prototype.eachLine = Doc.prototype.iter;

      // Kludge to work around strange IE behavior where it'll sometimes
      // re-fire a series of drag-related events right after the drop (#1551)
      var lastDrop = 0;

      function onDrop(e) {
        var cm = this;
        clearDragCursor(cm);
        if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) {
          return
        }
        e_preventDefault(e);
        if (ie) {
          lastDrop = +new Date;
        }
        var pos = posFromMouse(cm, e, true),
          files = e.dataTransfer.files;
        if (!pos || cm.isReadOnly()) {
          return
        }
        // Might be a file drop, in which case we simply extract the text
        // and insert it.
        if (files && files.length && window.FileReader && window.File) {
          var n = files.length,
            text = Array(n),
            read = 0;
          var loadFile = function(file, i) {
            if (cm.options.allowDropFileTypes &&
              indexOf(cm.options.allowDropFileTypes, file.type) == -1) {
              return
            }

            var reader = new FileReader;
            reader.onload = operation(cm, function() {
              var content = reader.result;
              if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) {
                content = "";
              }
              text[i] = content;
              if (++read == n) {
                pos = clipPos(cm.doc, pos);
                var change = {
                  from: pos,
                  to: pos,
                  text: cm.doc.splitLines(text.join(cm.doc.lineSeparator())),
                  origin: "paste"
                };
                makeChange(cm.doc, change);
                setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)));
              }
            });
            reader.readAsText(file);
          };
          for (var i = 0; i < n; ++i) {
            loadFile(files[i], i);
          }
        } else { // Normal drop
          // Don't do a replace if the drop happened inside of the selected text.
          if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
            cm.state.draggingText(e);
            // Ensure the editor is re-focused
            setTimeout(function() {
              return cm.display.input.focus();
            }, 20);
            return
          }
          try {
            var text$1 = e.dataTransfer.getData("Text");
            if (text$1) {
              var selected;
              if (cm.state.draggingText && !cm.state.draggingText.copy) {
                selected = cm.listSelections();
              }
              setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
              if (selected) {
                for (var i$1 = 0; i$1 < selected.length; ++i$1) {
                  replaceRange(cm.doc, "", selected[i$1].anchor, selected[i$1].head, "drag");
                }
              }
              cm.replaceSelection(text$1, "around", "paste");
              cm.display.input.focus();
            }
          } catch (e) {}
        }
      }

      function onDragStart(cm, e) {
        if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) {
          e_stop(e);
          return
        }
        if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) {
          return
        }

        e.dataTransfer.setData("Text", cm.getSelection());
        e.dataTransfer.effectAllowed = "copyMove";

        // Use dummy image instead of default browsers image.
        // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
        if (e.dataTransfer.setDragImage && !safari) {
          var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
          img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
          if (presto) {
            img.width = img.height = 1;
            cm.display.wrapper.appendChild(img);
            // Force a relayout, or Opera won't use our image for some obscure reason
            img._top = img.offsetTop;
          }
          e.dataTransfer.setDragImage(img, 0, 0);
          if (presto) {
            img.parentNode.removeChild(img);
          }
        }
      }

      function onDragOver(cm, e) {
        var pos = posFromMouse(cm, e);
        if (!pos) {
          return
        }
        var frag = document.createDocumentFragment();
        drawSelectionCursor(cm, pos, frag);
        if (!cm.display.dragCursor) {
          cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors");
          cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);
        }
        removeChildrenAndAdd(cm.display.dragCursor, frag);
      }

      function clearDragCursor(cm) {
        if (cm.display.dragCursor) {
          cm.display.lineSpace.removeChild(cm.display.dragCursor);
          cm.display.dragCursor = null;
        }
      }

      // These must be handled carefully, because naively registering a
      // handler for each editor will cause the editors to never be
      // garbage collected.

      function forEachCodeMirror(f) {
        if (!document.getElementsByClassName) {
          return
        }
        var byClass = document.getElementsByClassName("CodeMirror");
        for (var i = 0; i < byClass.length; i++) {
          var cm = byClass[i].CodeMirror;
          if (cm) {
            f(cm);
          }
        }
      }

      var globalsRegistered = false;

      function ensureGlobalHandlers() {
        if (globalsRegistered) {
          return
        }
        registerGlobalHandlers();
        globalsRegistered = true;
      }

      function registerGlobalHandlers() {
        // When the window resizes, we need to refresh active editors.
        var resizeTimer;
        on(window, "resize", function() {
          if (resizeTimer == null) {
            resizeTimer = setTimeout(function() {
              resizeTimer = null;
              forEachCodeMirror(onResize);
            }, 100);
          }
        });
        // When the window loses focus, we want to show the editor as blurred
        on(window, "blur", function() {
          return forEachCodeMirror(onBlur);
        });
      }
      // Called when the window resizes
      function onResize(cm) {
        var d = cm.display;
        if (d.lastWrapHeight == d.wrapper.clientHeight && d.lastWrapWidth == d.wrapper.clientWidth) {
          return
        }
        // Might be a text scaling operation, clear size caches.
        d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
        d.scrollbarsClipped = false;
        cm.setSize();
      }

      var keyNames = {
        3: "Pause",
        8: "Backspace",
        9: "Tab",
        13: "Enter",
        16: "Shift",
        17: "Ctrl",
        18: "Alt",
        19: "Pause",
        20: "CapsLock",
        27: "Esc",
        32: "Space",
        33: "PageUp",
        34: "PageDown",
        35: "End",
        36: "Home",
        37: "Left",
        38: "Up",
        39: "Right",
        40: "Down",
        44: "PrintScrn",
        45: "Insert",
        46: "Delete",
        59: ";",
        61: "=",
        91: "Mod",
        92: "Mod",
        93: "Mod",
        106: "*",
        107: "=",
        109: "-",
        110: ".",
        111: "/",
        127: "Delete",
        145: "ScrollLock",
        173: "-",
        186: ";",
        187: "=",
        188: ",",
        189: "-",
        190: ".",
        191: "/",
        192: "`",
        219: "[",
        220: "\\",
        221: "]",
        222: "'",
        63232: "Up",
        63233: "Down",
        63234: "Left",
        63235: "Right",
        63272: "Delete",
        63273: "Home",
        63275: "End",
        63276: "PageUp",
        63277: "PageDown",
        63302: "Insert"
      };

      // Number keys
      for (var i = 0; i < 10; i++) {
        keyNames[i + 48] = keyNames[i + 96] = String(i);
      }
      // Alphabetic keys
      for (var i$1 = 65; i$1 <= 90; i$1++) {
        keyNames[i$1] = String.fromCharCode(i$1);
      }
      // Function keys
      for (var i$2 = 1; i$2 <= 12; i$2++) {
        keyNames[i$2 + 111] = keyNames[i$2 + 63235] = "F" + i$2;
      }

      var keyMap = {};

      keyMap.basic = {
        "Left": "goCharLeft",
        "Right": "goCharRight",
        "Up": "goLineUp",
        "Down": "goLineDown",
        "End": "goLineEnd",
        "Home": "goLineStartSmart",
        "PageUp": "goPageUp",
        "PageDown": "goPageDown",
        "Delete": "delCharAfter",
        "Backspace": "delCharBefore",
        "Shift-Backspace": "delCharBefore",
        "Tab": "defaultTab",
        "Shift-Tab": "indentAuto",
        "Enter": "newlineAndIndent",
        "Insert": "toggleOverwrite",
        "Esc": "singleSelection"
      };
      // Note that the save and find-related commands aren't defined by
      // default. User code or addons can define them. Unknown commands
      // are simply ignored.
      keyMap.pcDefault = {
        "Ctrl-A": "selectAll",
        "Ctrl-D": "deleteLine",
        "Ctrl-Z": "undo",
        "Shift-Ctrl-Z": "redo",
        "Ctrl-Y": "redo",
        "Ctrl-Home": "goDocStart",
        "Ctrl-End": "goDocEnd",
        "Ctrl-Up": "goLineUp",
        "Ctrl-Down": "goLineDown",
        "Ctrl-Left": "goGroupLeft",
        "Ctrl-Right": "goGroupRight",
        "Alt-Left": "goLineStart",
        "Alt-Right": "goLineEnd",
        "Ctrl-Backspace": "delGroupBefore",
        "Ctrl-Delete": "delGroupAfter",
        "Ctrl-S": "save",
        "Ctrl-F": "find",
        "Ctrl-G": "findNext",
        "Shift-Ctrl-G": "findPrev",
        "Shift-Ctrl-F": "replace",
        "Shift-Ctrl-R": "replaceAll",
        "Ctrl-[": "indentLess",
        "Ctrl-]": "indentMore",
        "Ctrl-U": "undoSelection",
        "Shift-Ctrl-U": "redoSelection",
        "Alt-U": "redoSelection",
        fallthrough: "basic"
      };
      // Very basic readline/emacs-style bindings, which are standard on Mac.
      keyMap.emacsy = {
        "Ctrl-F": "goCharRight",
        "Ctrl-B": "goCharLeft",
        "Ctrl-P": "goLineUp",
        "Ctrl-N": "goLineDown",
        "Alt-F": "goWordRight",
        "Alt-B": "goWordLeft",
        "Ctrl-A": "goLineStart",
        "Ctrl-E": "goLineEnd",
        "Ctrl-V": "goPageDown",
        "Shift-Ctrl-V": "goPageUp",
        "Ctrl-D": "delCharAfter",
        "Ctrl-H": "delCharBefore",
        "Alt-D": "delWordAfter",
        "Alt-Backspace": "delWordBefore",
        "Ctrl-K": "killLine",
        "Ctrl-T": "transposeChars",
        "Ctrl-O": "openLine"
      };
      keyMap.macDefault = {
        "Cmd-A": "selectAll",
        "Cmd-D": "deleteLine",
        "Cmd-Z": "undo",
        "Shift-Cmd-Z": "redo",
        "Cmd-Y": "redo",
        "Cmd-Home": "goDocStart",
        "Cmd-Up": "goDocStart",
        "Cmd-End": "goDocEnd",
        "Cmd-Down": "goDocEnd",
        "Alt-Left": "goGroupLeft",
        "Alt-Right": "goGroupRight",
        "Cmd-Left": "goLineLeft",
        "Cmd-Right": "goLineRight",
        "Alt-Backspace": "delGroupBefore",
        "Ctrl-Alt-Backspace": "delGroupAfter",
        "Alt-Delete": "delGroupAfter",
        "Cmd-S": "save",
        "Cmd-F": "find",
        "Cmd-G": "findNext",
        "Shift-Cmd-G": "findPrev",
        "Cmd-Alt-F": "replace",
        "Shift-Cmd-Alt-F": "replaceAll",
        "Cmd-[": "indentLess",
        "Cmd-]": "indentMore",
        "Cmd-Backspace": "delWrappedLineLeft",
        "Cmd-Delete": "delWrappedLineRight",
        "Cmd-U": "undoSelection",
        "Shift-Cmd-U": "redoSelection",
        "Ctrl-Up": "goDocStart",
        "Ctrl-Down": "goDocEnd",
        fallthrough: ["basic", "emacsy"]
      };
      keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;

      // KEYMAP DISPATCH

      function normalizeKeyName(name) {
        var parts = name.split(/-(?!$)/);
        name = parts[parts.length - 1];
        var alt, ctrl, shift, cmd;
        for (var i = 0; i < parts.length - 1; i++) {
          var mod = parts[i];
          if (/^(cmd|meta|m)$/i.test(mod)) {
            cmd = true;
          } else if (/^a(lt)?$/i.test(mod)) {
            alt = true;
          } else if (/^(c|ctrl|control)$/i.test(mod)) {
            ctrl = true;
          } else if (/^s(hift)?$/i.test(mod)) {
            shift = true;
          } else {
            throw new Error("Unrecognized modifier name: " + mod)
          }
        }
        if (alt) {
          name = "Alt-" + name;
        }
        if (ctrl) {
          name = "Ctrl-" + name;
        }
        if (cmd) {
          name = "Cmd-" + name;
        }
        if (shift) {
          name = "Shift-" + name;
        }
        return name
      }

      // This is a kludge to keep keymaps mostly working as raw objects
      // (backwards compatibility) while at the same time support features
      // like normalization and multi-stroke key bindings. It compiles a
      // new normalized keymap, and then updates the old object to reflect
      // this.
      function normalizeKeyMap(keymap) {
        var copy = {};
        for (var keyname in keymap) {
          if (keymap.hasOwnProperty(keyname)) {
            var value = keymap[keyname];
            if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) {
              continue
            }
            if (value == "...") {
              delete keymap[keyname];
              continue
            }

            var keys = map(keyname.split(" "), normalizeKeyName);
            for (var i = 0; i < keys.length; i++) {
              var val = (void 0),
                name = (void 0);
              if (i == keys.length - 1) {
                name = keys.join(" ");
                val = value;
              } else {
                name = keys.slice(0, i + 1).join(" ");
                val = "...";
              }
              var prev = copy[name];
              if (!prev) {
                copy[name] = val;
              } else if (prev != val) {
                throw new Error("Inconsistent bindings for " + name)
              }
            }
            delete keymap[keyname];
          }
        }
        for (var prop in copy) {
          keymap[prop] = copy[prop];
        }
        return keymap
      }

      function lookupKey(key, map$$1, handle, context) {
        map$$1 = getKeyMap(map$$1);
        var found = map$$1.call ? map$$1.call(key, context) : map$$1[key];
        if (found === false) {
          return "nothing"
        }
        if (found === "...") {
          return "multi"
        }
        if (found != null && handle(found)) {
          return "handled"
        }

        if (map$$1.fallthrough) {
          if (Object.prototype.toString.call(map$$1.fallthrough) != "[object Array]") {
            return lookupKey(key, map$$1.fallthrough, handle, context)
          }
          for (var i = 0; i < map$$1.fallthrough.length; i++) {
            var result = lookupKey(key, map$$1.fallthrough[i], handle, context);
            if (result) {
              return result
            }
          }
        }
      }

      // Modifier key presses don't count as 'real' key presses for the
      // purpose of keymap fallthrough.
      function isModifierKey(value) {
        var name = typeof value == "string" ? value : keyNames[value.keyCode];
        return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod"
      }

      function addModifierNames(name, event, noShift) {
        var base = name;
        if (event.altKey && base != "Alt") {
          name = "Alt-" + name;
        }
        if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") {
          name = "Ctrl-" + name;
        }
        if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Cmd") {
          name = "Cmd-" + name;
        }
        if (!noShift && event.shiftKey && base != "Shift") {
          name = "Shift-" + name;
        }
        return name
      }

      // Look up the name of a key as indicated by an event object.
      function keyName(event, noShift) {
        if (presto && event.keyCode == 34 && event["char"]) {
          return false
        }
        var name = keyNames[event.keyCode];
        if (name == null || event.altGraphKey) {
          return false
        }
        // Ctrl-ScrollLock has keyCode 3, same as Ctrl-Pause,
        // so we'll use event.code when available (Chrome 48+, FF 38+, Safari 10.1+)
        if (event.keyCode == 3 && event.code) {
          name = event.code;
        }
        return addModifierNames(name, event, noShift)
      }

      function getKeyMap(val) {
        return typeof val == "string" ? keyMap[val] : val
      }

      // Helper for deleting text near the selection(s), used to implement
      // backspace, delete, and similar functionality.
      function deleteNearSelection(cm, compute) {
        var ranges = cm.doc.sel.ranges,
          kill = [];
        // Build up a set of ranges to kill first, merging overlapping
        // ranges.
        for (var i = 0; i < ranges.length; i++) {
          var toKill = compute(ranges[i]);
          while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
            var replaced = kill.pop();
            if (cmp(replaced.from, toKill.from) < 0) {
              toKill.from = replaced.from;
              break
            }
          }
          kill.push(toKill);
        }
        // Next, remove those actual ranges.
        runInOp(cm, function() {
          for (var i = kill.length - 1; i >= 0; i--) {
            replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete");
          }
          ensureCursorVisible(cm);
        });
      }

      function moveCharLogically(line, ch, dir) {
        var target = skipExtendingChars(line.text, ch + dir, dir);
        return target < 0 || target > line.text.length ? null : target
      }

      function moveLogically(line, start, dir) {
        var ch = moveCharLogically(line, start.ch, dir);
        return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")
      }

      function endOfLine(visually, cm, lineObj, lineNo, dir) {
        if (visually) {
          var order = getOrder(lineObj, cm.doc.direction);
          if (order) {
            var part = dir < 0 ? lst(order) : order[0];
            var moveInStorageOrder = (dir < 0) == (part.level == 1);
            var sticky = moveInStorageOrder ? "after" : "before";
            var ch;
            // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
            // it could be that the last bidi part is not on the last visual line,
            // since visual lines contain content order-consecutive chunks.
            // Thus, in rtl, we are looking for the first (content-order) character
            // in the rtl chunk that is on the last line (that is, the same line
            // as the last (content-order) character).
            if (part.level > 0 || cm.doc.direction == "rtl") {
              var prep = prepareMeasureForLine(cm, lineObj);
              ch = dir < 0 ? lineObj.text.length - 1 : 0;
              var targetTop = measureCharPrepared(cm, prep, ch).top;
              ch = findFirst(function(ch) {
                return measureCharPrepared(cm, prep, ch).top == targetTop;
              }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch);
              if (sticky == "before") {
                ch = moveCharLogically(lineObj, ch, 1);
              }
            } else {
              ch = dir < 0 ? part.to : part.from;
            }
            return new Pos(lineNo, ch, sticky)
          }
        }
        return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")
      }

      function moveVisually(cm, line, start, dir) {
        var bidi = getOrder(line, cm.doc.direction);
        if (!bidi) {
          return moveLogically(line, start, dir)
        }
        if (start.ch >= line.text.length) {
          start.ch = line.text.length;
          start.sticky = "before";
        } else if (start.ch <= 0) {
          start.ch = 0;
          start.sticky = "after";
        }
        var partPos = getBidiPartAt(bidi, start.ch, start.sticky),
          part = bidi[partPos];
        if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {
          // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
          // nothing interesting happens.
          return moveLogically(line, start, dir)
        }

        var mv = function(pos, dir) {
          return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir);
        };
        var prep;
        var getWrappedLineExtent = function(ch) {
          if (!cm.options.lineWrapping) {
            return {
              begin: 0,
              end: line.text.length
            }
          }
          prep = prep || prepareMeasureForLine(cm, line);
          return wrappedLineExtentChar(cm, line, prep, ch)
        };
        var wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch);

        if (cm.doc.direction == "rtl" || part.level == 1) {
          var moveInStorageOrder = (part.level == 1) == (dir < 0);
          var ch = mv(start, moveInStorageOrder ? 1 : -1);
          if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {
            // Case 2: We move within an rtl part or in an rtl editor on the same visual line
            var sticky = moveInStorageOrder ? "before" : "after";
            return new Pos(start.line, ch, sticky)
          }
        }

        // Case 3: Could not move within this bidi part in this visual line, so leave
        // the current bidi part

        var searchInVisualLine = function(partPos, dir, wrappedLineExtent) {
          var getRes = function(ch, moveInStorageOrder) {
            return moveInStorageOrder ?
              new Pos(start.line, mv(ch, 1), "before") :
              new Pos(start.line, ch, "after");
          };

          for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
            var part = bidi[partPos];
            var moveInStorageOrder = (dir > 0) == (part.level != 1);
            var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1);
            if (part.from <= ch && ch < part.to) {
              return getRes(ch, moveInStorageOrder)
            }
            ch = moveInStorageOrder ? part.from : mv(part.to, -1);
            if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) {
              return getRes(ch, moveInStorageOrder)
            }
          }
        };

        // Case 3a: Look for other bidi parts on the same visual line
        var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent);
        if (res) {
          return res
        }

        // Case 3b: Look for other bidi parts on the next visual line
        var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1);
        if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
          res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh));
          if (res) {
            return res
          }
        }

        // Case 4: Nowhere to move
        return null
      }

      // Commands are parameter-less actions that can be performed on an
      // editor, mostly used for keybindings.
      var commands = {
        selectAll: selectAll,
        singleSelection: function(cm) {
          return cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll);
        },
        killLine: function(cm) {
          return deleteNearSelection(cm, function(range) {
            if (range.empty()) {
              var len = getLine(cm.doc, range.head.line).text.length;
              if (range.head.ch == len && range.head.line < cm.lastLine()) {
                return {
                  from: range.head,
                  to: Pos(range.head.line + 1, 0)
                }
              } else {
                return {
                  from: range.head,
                  to: Pos(range.head.line, len)
                }
              }
            } else {
              return {
                from: range.from(),
                to: range.to()
              }
            }
          });
        },
        deleteLine: function(cm) {
          return deleteNearSelection(cm, function(range) {
            return ({
              from: Pos(range.from().line, 0),
              to: clipPos(cm.doc, Pos(range.to().line + 1, 0))
            });
          });
        },
        delLineLeft: function(cm) {
          return deleteNearSelection(cm, function(range) {
            return ({
              from: Pos(range.from().line, 0),
              to: range.from()
            });
          });
        },
        delWrappedLineLeft: function(cm) {
          return deleteNearSelection(cm, function(range) {
            var top = cm.charCoords(range.head, "div").top + 5;
            var leftPos = cm.coordsChar({
              left: 0,
              top: top
            }, "div");
            return {
              from: leftPos,
              to: range.from()
            }
          });
        },
        delWrappedLineRight: function(cm) {
          return deleteNearSelection(cm, function(range) {
            var top = cm.charCoords(range.head, "div").top + 5;
            var rightPos = cm.coordsChar({
              left: cm.display.lineDiv.offsetWidth + 100,
              top: top
            }, "div");
            return {
              from: range.from(),
              to: rightPos
            }
          });
        },
        undo: function(cm) {
          return cm.undo();
        },
        redo: function(cm) {
          return cm.redo();
        },
        undoSelection: function(cm) {
          return cm.undoSelection();
        },
        redoSelection: function(cm) {
          return cm.redoSelection();
        },
        goDocStart: function(cm) {
          return cm.extendSelection(Pos(cm.firstLine(), 0));
        },
        goDocEnd: function(cm) {
          return cm.extendSelection(Pos(cm.lastLine()));
        },
        goLineStart: function(cm) {
          return cm.extendSelectionsBy(function(range) {
            return lineStart(cm, range.head.line);
          }, {
            origin: "+move",
            bias: 1
          });
        },
        goLineStartSmart: function(cm) {
          return cm.extendSelectionsBy(function(range) {
            return lineStartSmart(cm, range.head);
          }, {
            origin: "+move",
            bias: 1
          });
        },
        goLineEnd: function(cm) {
          return cm.extendSelectionsBy(function(range) {
            return lineEnd(cm, range.head.line);
          }, {
            origin: "+move",
            bias: -1
          });
        },
        goLineRight: function(cm) {
          return cm.extendSelectionsBy(function(range) {
            var top = cm.cursorCoords(range.head, "div").top + 5;
            return cm.coordsChar({
              left: cm.display.lineDiv.offsetWidth + 100,
              top: top
            }, "div")
          }, sel_move);
        },
        goLineLeft: function(cm) {
          return cm.extendSelectionsBy(function(range) {
            var top = cm.cursorCoords(range.head, "div").top + 5;
            return cm.coordsChar({
              left: 0,
              top: top
            }, "div")
          }, sel_move);
        },
        goLineLeftSmart: function(cm) {
          return cm.extendSelectionsBy(function(range) {
            var top = cm.cursorCoords(range.head, "div").top + 5;
            var pos = cm.coordsChar({
              left: 0,
              top: top
            }, "div");
            if (pos.ch < cm.getLine(pos.line).search(/\S/)) {
              return lineStartSmart(cm, range.head)
            }
            return pos
          }, sel_move);
        },
        goLineUp: function(cm) {
          return cm.moveV(-1, "line");
        },
        goLineDown: function(cm) {
          return cm.moveV(1, "line");
        },
        goPageUp: function(cm) {
          return cm.moveV(-1, "page");
        },
        goPageDown: function(cm) {
          return cm.moveV(1, "page");
        },
        goCharLeft: function(cm) {
          return cm.moveH(-1, "char");
        },
        goCharRight: function(cm) {
          return cm.moveH(1, "char");
        },
        goColumnLeft: function(cm) {
          return cm.moveH(-1, "column");
        },
        goColumnRight: function(cm) {
          return cm.moveH(1, "column");
        },
        goWordLeft: function(cm) {
          return cm.moveH(-1, "word");
        },
        goGroupRight: function(cm) {
          return cm.moveH(1, "group");
        },
        goGroupLeft: function(cm) {
          return cm.moveH(-1, "group");
        },
        goWordRight: function(cm) {
          return cm.moveH(1, "word");
        },
        delCharBefore: function(cm) {
          return cm.deleteH(-1, "char");
        },
        delCharAfter: function(cm) {
          return cm.deleteH(1, "char");
        },
        delWordBefore: function(cm) {
          return cm.deleteH(-1, "word");
        },
        delWordAfter: function(cm) {
          return cm.deleteH(1, "word");
        },
        delGroupBefore: function(cm) {
          return cm.deleteH(-1, "group");
        },
        delGroupAfter: function(cm) {
          return cm.deleteH(1, "group");
        },
        indentAuto: function(cm) {
          return cm.indentSelection("smart");
        },
        indentMore: function(cm) {
          return cm.indentSelection("add");
        },
        indentLess: function(cm) {
          return cm.indentSelection("subtract");
        },
        insertTab: function(cm) {
          return cm.replaceSelection("\t");
        },
        insertSoftTab: function(cm) {
          var spaces = [],
            ranges = cm.listSelections(),
            tabSize = cm.options.tabSize;
          for (var i = 0; i < ranges.length; i++) {
            var pos = ranges[i].from();
            var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
            spaces.push(spaceStr(tabSize - col % tabSize));
          }
          cm.replaceSelections(spaces);
        },
        defaultTab: function(cm) {
          if (cm.somethingSelected()) {
            cm.indentSelection("add");
          } else {
            cm.execCommand("insertTab");
          }
        },
        // Swap the two chars left and right of each selection's head.
        // Move cursor behind the two swapped characters afterwards.
        //
        // Doesn't consider line feeds a character.
        // Doesn't scan more than one line above to find a character.
        // Doesn't do anything on an empty line.
        // Doesn't do anything with non-empty selections.
        transposeChars: function(cm) {
          return runInOp(cm, function() {
            var ranges = cm.listSelections(),
              newSel = [];
            for (var i = 0; i < ranges.length; i++) {
              if (!ranges[i].empty()) {
                continue
              }
              var cur = ranges[i].head,
                line = getLine(cm.doc, cur.line).text;
              if (line) {
                if (cur.ch == line.length) {
                  cur = new Pos(cur.line, cur.ch - 1);
                }
                if (cur.ch > 0) {
                  cur = new Pos(cur.line, cur.ch + 1);
                  cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
                    Pos(cur.line, cur.ch - 2), cur, "+transpose");
                } else if (cur.line > cm.doc.first) {
                  var prev = getLine(cm.doc, cur.line - 1).text;
                  if (prev) {
                    cur = new Pos(cur.line, 1);
                    cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
                      prev.charAt(prev.length - 1),
                      Pos(cur.line - 1, prev.length - 1), cur, "+transpose");
                  }
                }
              }
              newSel.push(new Range(cur, cur));
            }
            cm.setSelections(newSel);
          });
        },
        newlineAndIndent: function(cm) {
          return runInOp(cm, function() {
            var sels = cm.listSelections();
            for (var i = sels.length - 1; i >= 0; i--) {
              cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, "+input");
            }
            sels = cm.listSelections();
            for (var i$1 = 0; i$1 < sels.length; i$1++) {
              cm.indentLine(sels[i$1].from().line, null, true);
            }
            ensureCursorVisible(cm);
          });
        },
        openLine: function(cm) {
          return cm.replaceSelection("\n", "start");
        },
        toggleOverwrite: function(cm) {
          return cm.toggleOverwrite();
        }
      };


      function lineStart(cm, lineN) {
        var line = getLine(cm.doc, lineN);
        var visual = visualLine(line);
        if (visual != line) {
          lineN = lineNo(visual);
        }
        return endOfLine(true, cm, visual, lineN, 1)
      }

      function lineEnd(cm, lineN) {
        var line = getLine(cm.doc, lineN);
        var visual = visualLineEnd(line);
        if (visual != line) {
          lineN = lineNo(visual);
        }
        return endOfLine(true, cm, line, lineN, -1)
      }

      function lineStartSmart(cm, pos) {
        var start = lineStart(cm, pos.line);
        var line = getLine(cm.doc, start.line);
        var order = getOrder(line, cm.doc.direction);
        if (!order || order[0].level == 0) {
          var firstNonWS = Math.max(0, line.text.search(/\S/));
          var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
          return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)
        }
        return start
      }

      // Run a handler that was bound to a key.
      function doHandleBinding(cm, bound, dropShift) {
        if (typeof bound == "string") {
          bound = commands[bound];
          if (!bound) {
            return false
          }
        }
        // Ensure previous input has been read, so that the handler sees a
        // consistent view of the document
        cm.display.input.ensurePolled();
        var prevShift = cm.display.shift,
          done = false;
        try {
          if (cm.isReadOnly()) {
            cm.state.suppressEdits = true;
          }
          if (dropShift) {
            cm.display.shift = false;
          }
          done = bound(cm) != Pass;
        } finally {
          cm.display.shift = prevShift;
          cm.state.suppressEdits = false;
        }
        return done
      }

      function lookupKeyForEditor(cm, name, handle) {
        for (var i = 0; i < cm.state.keyMaps.length; i++) {
          var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
          if (result) {
            return result
          }
        }
        return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm)) ||
          lookupKey(name, cm.options.keyMap, handle, cm)
      }

      // Note that, despite the name, this function is also used to check
      // for bound mouse clicks.

      var stopSeq = new Delayed;

      function dispatchKey(cm, name, e, handle) {
        var seq = cm.state.keySeq;
        if (seq) {
          if (isModifierKey(name)) {
            return "handled"
          }
          if (/\'$/.test(name)) {
            cm.state.keySeq = null;
          } else {
            stopSeq.set(50, function() {
              if (cm.state.keySeq == seq) {
                cm.state.keySeq = null;
                cm.display.input.reset();
              }
            });
          }
          if (dispatchKeyInner(cm, seq + " " + name, e, handle)) {
            return true
          }
        }
        return dispatchKeyInner(cm, name, e, handle)
      }

      function dispatchKeyInner(cm, name, e, handle) {
        var result = lookupKeyForEditor(cm, name, handle);

        if (result == "multi") {
          cm.state.keySeq = name;
        }
        if (result == "handled") {
          signalLater(cm, "keyHandled", cm, name, e);
        }

        if (result == "handled" || result == "multi") {
          e_preventDefault(e);
          restartBlink(cm);
        }

        return !!result
      }

      // Handle a key from the keydown event.
      function handleKeyBinding(cm, e) {
        var name = keyName(e, true);
        if (!name) {
          return false
        }

        if (e.shiftKey && !cm.state.keySeq) {
          // First try to resolve full name (including 'Shift-'). Failing
          // that, see if there is a cursor-motion command (starting with
          // 'go') bound to the keyname without 'Shift-'.
          return dispatchKey(cm, "Shift-" + name, e, function(b) {
              return doHandleBinding(cm, b, true);
            }) ||
            dispatchKey(cm, name, e, function(b) {
              if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion) {
                return doHandleBinding(cm, b)
              }
            })
        } else {
          return dispatchKey(cm, name, e, function(b) {
            return doHandleBinding(cm, b);
          })
        }
      }

      // Handle a key from the keypress event
      function handleCharBinding(cm, e, ch) {
        return dispatchKey(cm, "'" + ch + "'", e, function(b) {
          return doHandleBinding(cm, b, true);
        })
      }

      var lastStoppedKey = null;

      function onKeyDown(e) {
        var cm = this;
        cm.curOp.focus = activeElt();
        if (signalDOMEvent(cm, e)) {
          return
        }
        // IE does strange things with escape.
        if (ie && ie_version < 11 && e.keyCode == 27) {
          e.returnValue = false;
        }
        var code = e.keyCode;
        cm.display.shift = code == 16 || e.shiftKey;
        var handled = handleKeyBinding(cm, e);
        if (presto) {
          lastStoppedKey = handled ? code : null;
          // Opera has no cut event... we try to at least catch the key combo
          if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey)) {
            cm.replaceSelection("", null, "cut");
          }
        }

        // Turn mouse into crosshair when Alt is held on Mac.
        if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className)) {
          showCrossHair(cm);
        }
      }

      function showCrossHair(cm) {
        var lineDiv = cm.display.lineDiv;
        addClass(lineDiv, "CodeMirror-crosshair");

        function up(e) {
          if (e.keyCode == 18 || !e.altKey) {
            rmClass(lineDiv, "CodeMirror-crosshair");
            off(document, "keyup", up);
            off(document, "mouseover", up);
          }
        }
        on(document, "keyup", up);
        on(document, "mouseover", up);
      }

      function onKeyUp(e) {
        if (e.keyCode == 16) {
          this.doc.sel.shift = false;
        }
        signalDOMEvent(this, e);
      }

      function onKeyPress(e) {
        var cm = this;
        if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) {
          return
        }
        var keyCode = e.keyCode,
          charCode = e.charCode;
        if (presto && keyCode == lastStoppedKey) {
          lastStoppedKey = null;
          e_preventDefault(e);
          return
        }
        if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) {
          return
        }
        var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
        // Some browsers fire keypress events for backspace
        if (ch == "\x08") {
          return
        }
        if (handleCharBinding(cm, e, ch)) {
          return
        }
        cm.display.input.onKeyPress(e);
      }

      var DOUBLECLICK_DELAY = 400;

      var PastClick = function(time, pos, button) {
        this.time = time;
        this.pos = pos;
        this.button = button;
      };

      PastClick.prototype.compare = function(time, pos, button) {
        return this.time + DOUBLECLICK_DELAY > time &&
          cmp(pos, this.pos) == 0 && button == this.button
      };

      var lastClick;
      var lastDoubleClick;

      function clickRepeat(pos, button) {
        var now = +new Date;
        if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {
          lastClick = lastDoubleClick = null;
          return "triple"
        } else if (lastClick && lastClick.compare(now, pos, button)) {
          lastDoubleClick = new PastClick(now, pos, button);
          lastClick = null;
          return "double"
        } else {
          lastClick = new PastClick(now, pos, button);
          lastDoubleClick = null;
          return "single"
        }
      }

      // A mouse down can be a single click, double click, triple click,
      // start of selection drag, start of text drag, new cursor
      // (ctrl-click), rectangle drag (alt-drag), or xwin
      // middle-click-paste. Or it might be a click on something we should
      // not interfere with, such as a scrollbar or widget.
      function onMouseDown(e) {
        var cm = this,
          display = cm.display;
        if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) {
          return
        }
        display.input.ensurePolled();
        display.shift = e.shiftKey;

        if (eventInWidget(display, e)) {
          if (!webkit) {
            // Briefly turn off draggability, to allow widgets to do
            // normal dragging things.
            display.scroller.draggable = false;
            setTimeout(function() {
              return display.scroller.draggable = true;
            }, 100);
          }
          return
        }
        if (clickInGutter(cm, e)) {
          return
        }
        var pos = posFromMouse(cm, e),
          button = e_button(e),
          repeat = pos ? clickRepeat(pos, button) : "single";
        window.focus();

        // #3261: make sure, that we're not starting a second selection
        if (button == 1 && cm.state.selectingText) {
          cm.state.selectingText(e);
        }

        if (pos && handleMappedButton(cm, button, pos, repeat, e)) {
          return
        }

        if (button == 1) {
          if (pos) {
            leftButtonDown(cm, pos, repeat, e);
          } else if (e_target(e) == display.scroller) {
            e_preventDefault(e);
          }
        } else if (button == 2) {
          if (pos) {
            extendSelection(cm.doc, pos);
          }
          setTimeout(function() {
            return display.input.focus();
          }, 20);
        } else if (button == 3) {
          if (captureRightClick) {
            onContextMenu(cm, e);
          } else {
            delayBlurEvent(cm);
          }
        }
      }

      function handleMappedButton(cm, button, pos, repeat, event) {
        var name = "Click";
        if (repeat == "double") {
          name = "Double" + name;
        } else if (repeat == "triple") {
          name = "Triple" + name;
        }
        name = (button == 1 ? "Left" : button == 2 ? "Middle" : "Right") + name;

        return dispatchKey(cm, addModifierNames(name, event), event, function(bound) {
          if (typeof bound == "string") {
            bound = commands[bound];
          }
          if (!bound) {
            return false
          }
          var done = false;
          try {
            if (cm.isReadOnly()) {
              cm.state.suppressEdits = true;
            }
            done = bound(cm, pos) != Pass;
          } finally {
            cm.state.suppressEdits = false;
          }
          return done
        })
      }

      function configureMouse(cm, repeat, event) {
        var option = cm.getOption("configureMouse");
        var value = option ? option(cm, repeat, event) : {};
        if (value.unit == null) {
          var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey;
          value.unit = rect ? "rectangle" : repeat == "single" ? "char" : repeat == "double" ? "word" : "line";
        }
        if (value.extend == null || cm.doc.extend) {
          value.extend = cm.doc.extend || event.shiftKey;
        }
        if (value.addNew == null) {
          value.addNew = mac ? event.metaKey : event.ctrlKey;
        }
        if (value.moveOnDrag == null) {
          value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey);
        }
        return value
      }

      function leftButtonDown(cm, pos, repeat, event) {
        if (ie) {
          setTimeout(bind(ensureFocus, cm), 0);
        } else {
          cm.curOp.focus = activeElt();
        }

        var behavior = configureMouse(cm, repeat, event);

        var sel = cm.doc.sel,
          contained;
        if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
          repeat == "single" && (contained = sel.contains(pos)) > -1 &&
          (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&
          (cmp(contained.to(), pos) > 0 || pos.xRel < 0)) {
          leftButtonStartDrag(cm, event, pos, behavior);
        } else {
          leftButtonSelect(cm, event, pos, behavior);
        }
      }

      // Start a text drag. When it ends, see if any dragging actually
      // happen, and treat as a click if it didn't.
      function leftButtonStartDrag(cm, event, pos, behavior) {
        var display = cm.display,
          moved = false;
        var dragEnd = operation(cm, function(e) {
          if (webkit) {
            display.scroller.draggable = false;
          }
          cm.state.draggingText = false;
          off(document, "mouseup", dragEnd);
          off(document, "mousemove", mouseMove);
          off(display.scroller, "dragstart", dragStart);
          off(display.scroller, "drop", dragEnd);
          if (!moved) {
            e_preventDefault(e);
            if (!behavior.addNew) {
              extendSelection(cm.doc, pos, null, null, behavior.extend);
            }
            // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
            if (webkit || ie && ie_version == 9) {
              setTimeout(function() {
                document.body.focus();
                display.input.focus();
              }, 20);
            } else {
              display.input.focus();
            }
          }
        });
        var mouseMove = function(e2) {
          moved = moved || Math.abs(event.clientX - e2.clientX) + Math.abs(event.clientY - e2.clientY) >= 10;
        };
        var dragStart = function() {
          return moved = true;
        };
        // Let the drag handler handle this.
        if (webkit) {
          display.scroller.draggable = true;
        }
        cm.state.draggingText = dragEnd;
        dragEnd.copy = !behavior.moveOnDrag;
        // IE's approach to draggable
        if (display.scroller.dragDrop) {
          display.scroller.dragDrop();
        }
        on(document, "mouseup", dragEnd);
        on(document, "mousemove", mouseMove);
        on(display.scroller, "dragstart", dragStart);
        on(display.scroller, "drop", dragEnd);

        delayBlurEvent(cm);
        setTimeout(function() {
          return display.input.focus();
        }, 20);
      }

      function rangeForUnit(cm, pos, unit) {
        if (unit == "char") {
          return new Range(pos, pos)
        }
        if (unit == "word") {
          return cm.findWordAt(pos)
        }
        if (unit == "line") {
          return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0)))
        }
        var result = unit(cm, pos);
        return new Range(result.from, result.to)
      }

      // Normal selection, as opposed to text dragging.
      function leftButtonSelect(cm, event, start, behavior) {
        var display = cm.display,
          doc = cm.doc;
        e_preventDefault(event);

        var ourRange, ourIndex, startSel = doc.sel,
          ranges = startSel.ranges;
        if (behavior.addNew && !behavior.extend) {
          ourIndex = doc.sel.contains(start);
          if (ourIndex > -1) {
            ourRange = ranges[ourIndex];
          } else {
            ourRange = new Range(start, start);
          }
        } else {
          ourRange = doc.sel.primary();
          ourIndex = doc.sel.primIndex;
        }

        if (behavior.unit == "rectangle") {
          if (!behavior.addNew) {
            ourRange = new Range(start, start);
          }
          start = posFromMouse(cm, event, true, true);
          ourIndex = -1;
        } else {
          var range$$1 = rangeForUnit(cm, start, behavior.unit);
          if (behavior.extend) {
            ourRange = extendRange(ourRange, range$$1.anchor, range$$1.head, behavior.extend);
          } else {
            ourRange = range$$1;
          }
        }

        if (!behavior.addNew) {
          ourIndex = 0;
          setSelection(doc, new Selection([ourRange], 0), sel_mouse);
          startSel = doc.sel;
        } else if (ourIndex == -1) {
          ourIndex = ranges.length;
          setSelection(doc, normalizeSelection(ranges.concat([ourRange]), ourIndex), {
            scroll: false,
            origin: "*mouse"
          });
        } else if (ranges.length > 1 && ranges[ourIndex].empty() && behavior.unit == "char" && !behavior.extend) {
          setSelection(doc, normalizeSelection(ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0), {
            scroll: false,
            origin: "*mouse"
          });
          startSel = doc.sel;
        } else {
          replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
        }

        var lastPos = start;

        function extendTo(pos) {
          if (cmp(lastPos, pos) == 0) {
            return
          }
          lastPos = pos;

          if (behavior.unit == "rectangle") {
            var ranges = [],
              tabSize = cm.options.tabSize;
            var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);
            var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
            var left = Math.min(startCol, posCol),
              right = Math.max(startCol, posCol);
            for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line)); line <= end; line++) {
              var text = getLine(doc, line).text,
                leftPos = findColumn(text, left, tabSize);
              if (left == right) {
                ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos)));
              } else if (text.length > leftPos) {
                ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize))));
              }
            }
            if (!ranges.length) {
              ranges.push(new Range(start, start));
            }
            setSelection(doc, normalizeSelection(startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex), {
              origin: "*mouse",
              scroll: false
            });
            cm.scrollIntoView(pos);
          } else {
            var oldRange = ourRange;
            var range$$1 = rangeForUnit(cm, pos, behavior.unit);
            var anchor = oldRange.anchor,
              head;
            if (cmp(range$$1.anchor, anchor) > 0) {
              head = range$$1.head;
              anchor = minPos(oldRange.from(), range$$1.anchor);
            } else {
              head = range$$1.anchor;
              anchor = maxPos(oldRange.to(), range$$1.head);
            }
            var ranges$1 = startSel.ranges.slice(0);
            ranges$1[ourIndex] = bidiSimplify(cm, new Range(clipPos(doc, anchor), head));
            setSelection(doc, normalizeSelection(ranges$1, ourIndex), sel_mouse);
          }
        }

        var editorSize = display.wrapper.getBoundingClientRect();
        // Used to ensure timeout re-tries don't fire when another extend
        // happened in the meantime (clearTimeout isn't reliable -- at
        // least on Chrome, the timeouts still happen even when cleared,
        // if the clear happens after their scheduled firing time).
        var counter = 0;

        function extend(e) {
          var curCount = ++counter;
          var cur = posFromMouse(cm, e, true, behavior.unit == "rectangle");
          if (!cur) {
            return
          }
          if (cmp(cur, lastPos) != 0) {
            cm.curOp.focus = activeElt();
            extendTo(cur);
            var visible = visibleLines(display, doc);
            if (cur.line >= visible.to || cur.line < visible.from) {
              setTimeout(operation(cm, function() {
                if (counter == curCount) {
                  extend(e);
                }
              }), 150);
            }
          } else {
            var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
            if (outside) {
              setTimeout(operation(cm, function() {
                if (counter != curCount) {
                  return
                }
                display.scroller.scrollTop += outside;
                extend(e);
              }), 50);
            }
          }
        }

        function done(e) {
          cm.state.selectingText = false;
          counter = Infinity;
          e_preventDefault(e);
          display.input.focus();
          off(document, "mousemove", move);
          off(document, "mouseup", up);
          doc.history.lastSelOrigin = null;
        }

        var move = operation(cm, function(e) {
          if (!e_button(e)) {
            done(e);
          } else {
            extend(e);
          }
        });
        var up = operation(cm, done);
        cm.state.selectingText = up;
        on(document, "mousemove", move);
        on(document, "mouseup", up);
      }

      // Used when mouse-selecting to adjust the anchor to the proper side
      // of a bidi jump depending on the visual position of the head.
      function bidiSimplify(cm, range$$1) {
        var anchor = range$$1.anchor;
        var head = range$$1.head;
        var anchorLine = getLine(cm.doc, anchor.line);
        if (cmp(anchor, head) == 0 && anchor.sticky == head.sticky) {
          return range$$1
        }
        var order = getOrder(anchorLine);
        if (!order) {
          return range$$1
        }
        var index = getBidiPartAt(order, anchor.ch, anchor.sticky),
          part = order[index];
        if (part.from != anchor.ch && part.to != anchor.ch) {
          return range$$1
        }
        var boundary = index + ((part.from == anchor.ch) == (part.level != 1) ? 0 : 1);
        if (boundary == 0 || boundary == order.length) {
          return range$$1
        }

        // Compute the relative visual position of the head compared to the
        // anchor (<0 is to the left, >0 to the right)
        var leftSide;
        if (head.line != anchor.line) {
          leftSide = (head.line - anchor.line) * (cm.doc.direction == "ltr" ? 1 : -1) > 0;
        } else {
          var headIndex = getBidiPartAt(order, head.ch, head.sticky);
          var dir = headIndex - index || (head.ch - anchor.ch) * (part.level == 1 ? -1 : 1);
          if (headIndex == boundary - 1 || headIndex == boundary) {
            leftSide = dir < 0;
          } else {
            leftSide = dir > 0;
          }
        }

        var usePart = order[boundary + (leftSide ? -1 : 0)];
        var from = leftSide == (usePart.level == 1);
        var ch = from ? usePart.from : usePart.to,
          sticky = from ? "after" : "before";
        return anchor.ch == ch && anchor.sticky == sticky ? range$$1 : new Range(new Pos(anchor.line, ch, sticky), head)
      }


      // Determines whether an event happened in the gutter, and fires the
      // handlers for the corresponding event.
      function gutterEvent(cm, e, type, prevent) {
        var mX, mY;
        if (e.touches) {
          mX = e.touches[0].clientX;
          mY = e.touches[0].clientY;
        } else {
          try {
            mX = e.clientX;
            mY = e.clientY;
          } catch (e) {
            return false
          }
        }
        if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) {
          return false
        }
        if (prevent) {
          e_preventDefault(e);
        }

        var display = cm.display;
        var lineBox = display.lineDiv.getBoundingClientRect();

        if (mY > lineBox.bottom || !hasHandler(cm, type)) {
          return e_defaultPrevented(e)
        }
        mY -= lineBox.top - display.viewOffset;

        for (var i = 0; i < cm.options.gutters.length; ++i) {
          var g = display.gutters.childNodes[i];
          if (g && g.getBoundingClientRect().right >= mX) {
            var line = lineAtHeight(cm.doc, mY);
            var gutter = cm.options.gutters[i];
            signal(cm, type, cm, line, gutter, e);
            return e_defaultPrevented(e)
          }
        }
      }

      function clickInGutter(cm, e) {
        return gutterEvent(cm, e, "gutterClick", true)
      }

      // CONTEXT MENU HANDLING

      // To make the context menu work, we need to briefly unhide the
      // textarea (making it as unobtrusive as possible) to let the
      // right-click take effect on it.
      function onContextMenu(cm, e) {
        if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) {
          return
        }
        if (signalDOMEvent(cm, e, "contextmenu")) {
          return
        }
        cm.display.input.onContextMenu(e);
      }

      function contextMenuInGutter(cm, e) {
        if (!hasHandler(cm, "gutterContextMenu")) {
          return false
        }
        return gutterEvent(cm, e, "gutterContextMenu", false)
      }

      function themeChanged(cm) {
        cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
          cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
        clearCaches(cm);
      }

      var Init = {
        toString: function() {
          return "CodeMirror.Init"
        }
      };

      var defaults = {};
      var optionHandlers = {};

      function defineOptions(CodeMirror) {
        var optionHandlers = CodeMirror.optionHandlers;

        function option(name, deflt, handle, notOnInit) {
          CodeMirror.defaults[name] = deflt;
          if (handle) {
            optionHandlers[name] =
              notOnInit ? function(cm, val, old) {
                if (old != Init) {
                  handle(cm, val, old);
                }
              } : handle;
          }
        }

        CodeMirror.defineOption = option;

        // Passed to option handlers when there is no old value.
        CodeMirror.Init = Init;

        // These two are, on init, called from the constructor because they
        // have to be initialized before the editor can start at all.
        option("value", "", function(cm, val) {
          return cm.setValue(val);
        }, true);
        option("mode", null, function(cm, val) {
          cm.doc.modeOption = val;
          loadMode(cm);
        }, true);

        option("indentUnit", 2, loadMode, true);
        option("indentWithTabs", false);
        option("smartIndent", true);
        option("tabSize", 4, function(cm) {
          resetModeState(cm);
          clearCaches(cm);
          regChange(cm);
        }, true);

        option("lineSeparator", null, function(cm, val) {
          cm.doc.lineSep = val;
          if (!val) {
            return
          }
          var newBreaks = [],
            lineNo = cm.doc.first;
          cm.doc.iter(function(line) {
            for (var pos = 0;;) {
              var found = line.text.indexOf(val, pos);
              if (found == -1) {
                break
              }
              pos = found + val.length;
              newBreaks.push(Pos(lineNo, found));
            }
            lineNo++;
          });
          for (var i = newBreaks.length - 1; i >= 0; i--) {
            replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length));
          }
        });
        option("specialChars", /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b-\u200f\u2028\u2029\ufeff]/g, function(cm, val, old) {
          cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
          if (old != Init) {
            cm.refresh();
          }
        });
        option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function(cm) {
          return cm.refresh();
        }, true);
        option("electricChars", true);
        option("inputStyle", mobile ? "contenteditable" : "textarea", function() {
          throw new Error("inputStyle can not (yet) be changed in a running editor") // FIXME
        }, true);
        option("spellcheck", false, function(cm, val) {
          return cm.getInputField().spellcheck = val;
        }, true);
        option("rtlMoveVisually", !windows);
        option("wholeLineUpdateBefore", true);

        option("theme", "default", function(cm) {
          themeChanged(cm);
          guttersChanged(cm);
        }, true);
        option("keyMap", "default", function(cm, val, old) {
          var next = getKeyMap(val);
          var prev = old != Init && getKeyMap(old);
          if (prev && prev.detach) {
            prev.detach(cm, next);
          }
          if (next.attach) {
            next.attach(cm, prev || null);
          }
        });
        option("extraKeys", null);
        option("configureMouse", null);

        option("lineWrapping", false, wrappingChanged, true);
        option("gutters", [], function(cm) {
          setGuttersForLineNumbers(cm.options);
          guttersChanged(cm);
        }, true);
        option("fixedGutter", true, function(cm, val) {
          cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
          cm.refresh();
        }, true);
        option("coverGutterNextToScrollbar", false, function(cm) {
          return updateScrollbars(cm);
        }, true);
        option("scrollbarStyle", "native", function(cm) {
          initScrollbars(cm);
          updateScrollbars(cm);
          cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);
          cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);
        }, true);
        option("lineNumbers", false, function(cm) {
          setGuttersForLineNumbers(cm.options);
          guttersChanged(cm);
        }, true);
        option("firstLineNumber", 1, guttersChanged, true);
        option("lineNumberFormatter", function(integer) {
          return integer;
        }, guttersChanged, true);
        option("showCursorWhenSelecting", false, updateSelection, true);

        option("resetSelectionOnContextMenu", true);
        option("lineWiseCopyCut", true);
        option("pasteLinesPerSelection", true);

        option("readOnly", false, function(cm, val) {
          if (val == "nocursor") {
            onBlur(cm);
            cm.display.input.blur();
          }
          cm.display.input.readOnlyChanged(val);
        });
        option("disableInput", false, function(cm, val) {
          if (!val) {
            cm.display.input.reset();
          }
        }, true);
        option("dragDrop", true, dragDropChanged);
        option("allowDropFileTypes", null);

        option("cursorBlinkRate", 530);
        option("cursorScrollMargin", 0);
        option("cursorHeight", 1, updateSelection, true);
        option("singleCursorHeightPerLine", true, updateSelection, true);
        option("workTime", 100);
        option("workDelay", 100);
        option("flattenSpans", true, resetModeState, true);
        option("addModeClass", false, resetModeState, true);
        option("pollInterval", 100);
        option("undoDepth", 200, function(cm, val) {
          return cm.doc.history.undoDepth = val;
        });
        option("historyEventDelay", 1250);
        option("viewportMargin", 10, function(cm) {
          return cm.refresh();
        }, true);
        option("maxHighlightLength", 10000, resetModeState, true);
        option("moveInputWithCursor", true, function(cm, val) {
          if (!val) {
            cm.display.input.resetPosition();
          }
        });

        option("tabindex", null, function(cm, val) {
          return cm.display.input.getField().tabIndex = val || "";
        });
        option("autofocus", null);
        option("direction", "ltr", function(cm, val) {
          return cm.doc.setDirection(val);
        }, true);
      }

      function guttersChanged(cm) {
        updateGutters(cm);
        regChange(cm);
        alignHorizontally(cm);
      }

      function dragDropChanged(cm, value, old) {
        var wasOn = old && old != Init;
        if (!value != !wasOn) {
          var funcs = cm.display.dragFunctions;
          var toggle = value ? on : off;
          toggle(cm.display.scroller, "dragstart", funcs.start);
          toggle(cm.display.scroller, "dragenter", funcs.enter);
          toggle(cm.display.scroller, "dragover", funcs.over);
          toggle(cm.display.scroller, "dragleave", funcs.leave);
          toggle(cm.display.scroller, "drop", funcs.drop);
        }
      }

      function wrappingChanged(cm) {
        if (cm.options.lineWrapping) {
          addClass(cm.display.wrapper, "CodeMirror-wrap");
          cm.display.sizer.style.minWidth = "";
          cm.display.sizerWidth = null;
        } else {
          rmClass(cm.display.wrapper, "CodeMirror-wrap");
          findMaxLine(cm);
        }
        estimateLineHeights(cm);
        regChange(cm);
        clearCaches(cm);
        setTimeout(function() {
          return updateScrollbars(cm);
        }, 100);
      }

      // A CodeMirror instance represents an editor. This is the object
      // that user code is usually dealing with.

      function CodeMirror$1(place, options) {
        var this$1 = this;

        if (!(this instanceof CodeMirror$1)) {
          return new CodeMirror$1(place, options)
        }

        this.options = options = options ? copyObj(options) : {};
        // Determine effective options based on given values and defaults.
        copyObj(defaults, options, false);
        setGuttersForLineNumbers(options);

        var doc = options.value;
        if (typeof doc == "string") {
          doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction);
        }
        this.doc = doc;

        var input = new CodeMirror$1.inputStyles[options.inputStyle](this);
        var display = this.display = new Display(place, doc, input);
        display.wrapper.CodeMirror = this;
        updateGutters(this);
        themeChanged(this);
        if (options.lineWrapping) {
          this.display.wrapper.className += " CodeMirror-wrap";
        }
        initScrollbars(this);

        this.state = {
          keyMaps: [], // stores maps added by addKeyMap
          overlays: [], // highlighting overlays, as added by addOverlay
          modeGen: 0, // bumped when mode/overlay changes, used to invalidate highlighting info
          overwrite: false,
          delayingBlurEvent: false,
          focused: false,
          suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
          pasteIncoming: false,
          cutIncoming: false, // help recognize paste/cut edits in input.poll
          selectingText: false,
          draggingText: false,
          highlight: new Delayed(), // stores highlight worker timeout
          keySeq: null, // Unfinished key sequence
          specialChars: null
        };

        if (options.autofocus && !mobile) {
          display.input.focus();
        }

        // Override magic textarea content restore that IE sometimes does
        // on our hidden textarea on reload
        if (ie && ie_version < 11) {
          setTimeout(function() {
            return this$1.display.input.reset(true);
          }, 20);
        }

        registerEventHandlers(this);
        ensureGlobalHandlers();

        startOperation(this);
        this.curOp.forceUpdate = true;
        attachDoc(this, doc);

        if ((options.autofocus && !mobile) || this.hasFocus()) {
          setTimeout(bind(onFocus, this), 20);
        } else {
          onBlur(this);
        }

        for (var opt in optionHandlers) {
          if (optionHandlers.hasOwnProperty(opt)) {
            optionHandlers[opt](this$1, options[opt], Init);
          }
        }
        maybeUpdateLineNumberWidth(this);
        if (options.finishInit) {
          options.finishInit(this);
        }
        for (var i = 0; i < initHooks.length; ++i) {
          initHooks[i](this$1);
        }
        endOperation(this);
        // Suppress optimizelegibility in Webkit, since it breaks text
        // measuring on line wrapping boundaries.
        if (webkit && options.lineWrapping &&
          getComputedStyle(display.lineDiv).textRendering == "optimizelegibility") {
          display.lineDiv.style.textRendering = "auto";
        }
      }

      // The default configuration options.
      CodeMirror$1.defaults = defaults;
      // Functions to run when options are changed.
      CodeMirror$1.optionHandlers = optionHandlers;

      // Attach the necessary event handlers when initializing the editor
      function registerEventHandlers(cm) {
        var d = cm.display;
        on(d.scroller, "mousedown", operation(cm, onMouseDown));
        // Older IE's will not fire a second mousedown for a double click
        if (ie && ie_version < 11) {
          on(d.scroller, "dblclick", operation(cm, function(e) {
            if (signalDOMEvent(cm, e)) {
              return
            }
            var pos = posFromMouse(cm, e);
            if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) {
              return
            }
            e_preventDefault(e);
            var word = cm.findWordAt(pos);
            extendSelection(cm.doc, word.anchor, word.head);
          }));
        } else {
          on(d.scroller, "dblclick", function(e) {
            return signalDOMEvent(cm, e) || e_preventDefault(e);
          });
        }
        // Some browsers fire contextmenu *after* opening the menu, at
        // which point we can't mess with it anymore. Context menu is
        // handled in onMouseDown for these browsers.
        if (!captureRightClick) {
          on(d.scroller, "contextmenu", function(e) {
            return onContextMenu(cm, e);
          });
        }

        // Used to suppress mouse event handling when a touch happens
        var touchFinished, prevTouch = {
          end: 0
        };

        function finishTouch() {
          if (d.activeTouch) {
            touchFinished = setTimeout(function() {
              return d.activeTouch = null;
            }, 1000);
            prevTouch = d.activeTouch;
            prevTouch.end = +new Date;
          }
        }

        function isMouseLikeTouchEvent(e) {
          if (e.touches.length != 1) {
            return false
          }
          var touch = e.touches[0];
          return touch.radiusX <= 1 && touch.radiusY <= 1
        }

        function farAway(touch, other) {
          if (other.left == null) {
            return true
          }
          var dx = other.left - touch.left,
            dy = other.top - touch.top;
          return dx * dx + dy * dy > 20 * 20
        }
        on(d.scroller, "touchstart", function(e) {
          if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e) && !clickInGutter(cm, e)) {
            d.input.ensurePolled();
            clearTimeout(touchFinished);
            var now = +new Date;
            d.activeTouch = {
              start: now,
              moved: false,
              prev: now - prevTouch.end <= 300 ? prevTouch : null
            };
            if (e.touches.length == 1) {
              d.activeTouch.left = e.touches[0].pageX;
              d.activeTouch.top = e.touches[0].pageY;
            }
          }
        });
        on(d.scroller, "touchmove", function() {
          if (d.activeTouch) {
            d.activeTouch.moved = true;
          }
        });
        on(d.scroller, "touchend", function(e) {
          var touch = d.activeTouch;
          if (touch && !eventInWidget(d, e) && touch.left != null &&
            !touch.moved && new Date - touch.start < 300) {
            var pos = cm.coordsChar(d.activeTouch, "page"),
              range;
            if (!touch.prev || farAway(touch, touch.prev)) // Single tap
            {
              range = new Range(pos, pos);
            } else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
            {
              range = cm.findWordAt(pos);
            } else // Triple tap
            {
              range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0)));
            }
            cm.setSelection(range.anchor, range.head);
            cm.focus();
            e_preventDefault(e);
          }
          finishTouch();
        });
        on(d.scroller, "touchcancel", finishTouch);

        // Sync scrolling between fake scrollbars and real scrollable
        // area, ensure viewport is updated when scrolling.
        on(d.scroller, "scroll", function() {
          if (d.scroller.clientHeight) {
            updateScrollTop(cm, d.scroller.scrollTop);
            setScrollLeft(cm, d.scroller.scrollLeft, true);
            signal(cm, "scroll", cm);
          }
        });

        // Listen to wheel events in order to try and update the viewport on time.
        on(d.scroller, "mousewheel", function(e) {
          return onScrollWheel(cm, e);
        });
        on(d.scroller, "DOMMouseScroll", function(e) {
          return onScrollWheel(cm, e);
        });

        // Prevent wrapper from ever scrolling
        on(d.wrapper, "scroll", function() {
          return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0;
        });

        d.dragFunctions = {
          enter: function(e) {
            if (!signalDOMEvent(cm, e)) {
              e_stop(e);
            }
          },
          over: function(e) {
            if (!signalDOMEvent(cm, e)) {
              onDragOver(cm, e);
              e_stop(e);
            }
          },
          start: function(e) {
            return onDragStart(cm, e);
          },
          drop: operation(cm, onDrop),
          leave: function(e) {
            if (!signalDOMEvent(cm, e)) {
              clearDragCursor(cm);
            }
          }
        };

        var inp = d.input.getField();
        on(inp, "keyup", function(e) {
          return onKeyUp.call(cm, e);
        });
        on(inp, "keydown", operation(cm, onKeyDown));
        on(inp, "keypress", operation(cm, onKeyPress));
        on(inp, "focus", function(e) {
          return onFocus(cm, e);
        });
        on(inp, "blur", function(e) {
          return onBlur(cm, e);
        });
      }

      var initHooks = [];
      CodeMirror$1.defineInitHook = function(f) {
        return initHooks.push(f);
      };

      // Indent the given line. The how parameter can be "smart",
      // "add"/null, "subtract", or "prev". When aggressive is false
      // (typically set to true for forced single-line indents), empty
      // lines are not indented, and places where the mode returns Pass
      // are left alone.
      function indentLine(cm, n, how, aggressive) {
        var doc = cm.doc,
          state;
        if (how == null) {
          how = "add";
        }
        if (how == "smart") {
          // Fall back to "prev" when the mode doesn't have an indentation
          // method.
          if (!doc.mode.indent) {
            how = "prev";
          } else {
            state = getContextBefore(cm, n).state;
          }
        }

        var tabSize = cm.options.tabSize;
        var line = getLine(doc, n),
          curSpace = countColumn(line.text, null, tabSize);
        if (line.stateAfter) {
          line.stateAfter = null;
        }
        var curSpaceString = line.text.match(/^\s*/)[0],
          indentation;
        if (!aggressive && !/\S/.test(line.text)) {
          indentation = 0;
          how = "not";
        } else if (how == "smart") {
          indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
          if (indentation == Pass || indentation > 150) {
            if (!aggressive) {
              return
            }
            how = "prev";
          }
        }
        if (how == "prev") {
          if (n > doc.first) {
            indentation = countColumn(getLine(doc, n - 1).text, null, tabSize);
          } else {
            indentation = 0;
          }
        } else if (how == "add") {
          indentation = curSpace + cm.options.indentUnit;
        } else if (how == "subtract") {
          indentation = curSpace - cm.options.indentUnit;
        } else if (typeof how == "number") {
          indentation = curSpace + how;
        }
        indentation = Math.max(0, indentation);

        var indentString = "",
          pos = 0;
        if (cm.options.indentWithTabs) {
          for (var i = Math.floor(indentation / tabSize); i; --i) {
            pos += tabSize;
            indentString += "\t";
          }
        }
        if (pos < indentation) {
          indentString += spaceStr(indentation - pos);
        }

        if (indentString != curSpaceString) {
          replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
          line.stateAfter = null;
          return true
        } else {
          // Ensure that, if the cursor was in the whitespace at the start
          // of the line, it is moved to the end of that space.
          for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {
            var range = doc.sel.ranges[i$1];
            if (range.head.line == n && range.head.ch < curSpaceString.length) {
              var pos$1 = Pos(n, curSpaceString.length);
              replaceOneSelection(doc, i$1, new Range(pos$1, pos$1));
              break
            }
          }
        }
      }

      // This will be set to a {lineWise: bool, text: [string]} object, so
      // that, when pasting, we know what kind of selections the copied
      // text was made out of.
      var lastCopied = null;

      function setLastCopied(newLastCopied) {
        lastCopied = newLastCopied;
      }

      function applyTextInput(cm, inserted, deleted, sel, origin) {
        var doc = cm.doc;
        cm.display.shift = false;
        if (!sel) {
          sel = doc.sel;
        }

        var paste = cm.state.pasteIncoming || origin == "paste";
        var textLines = splitLinesAuto(inserted),
          multiPaste = null;
        // When pasting N lines into N selections, insert one line per selection
        if (paste && sel.ranges.length > 1) {
          if (lastCopied && lastCopied.text.join("\n") == inserted) {
            if (sel.ranges.length % lastCopied.text.length == 0) {
              multiPaste = [];
              for (var i = 0; i < lastCopied.text.length; i++) {
                multiPaste.push(doc.splitLines(lastCopied.text[i]));
              }
            }
          } else if (textLines.length == sel.ranges.length && cm.options.pasteLinesPerSelection) {
            multiPaste = map(textLines, function(l) {
              return [l];
            });
          }
        }

        var updateInput;
        // Normal behavior is to insert the new text into every selection
        for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {
          var range$$1 = sel.ranges[i$1];
          var from = range$$1.from(),
            to = range$$1.to();
          if (range$$1.empty()) {
            if (deleted && deleted > 0) // Handle deletion
            {
              from = Pos(from.line, from.ch - deleted);
            } else if (cm.state.overwrite && !paste) // Handle overwrite
            {
              to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length));
            } else if (lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == inserted) {
              from = to = Pos(from.line, 0);
            }
          }
          updateInput = cm.curOp.updateInput;
          var changeEvent = {
            from: from,
            to: to,
            text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,
            origin: origin || (paste ? "paste" : cm.state.cutIncoming ? "cut" : "+input")
          };
          makeChange(cm.doc, changeEvent);
          signalLater(cm, "inputRead", cm, changeEvent);
        }
        if (inserted && !paste) {
          triggerElectric(cm, inserted);
        }

        ensureCursorVisible(cm);
        cm.curOp.updateInput = updateInput;
        cm.curOp.typing = true;
        cm.state.pasteIncoming = cm.state.cutIncoming = false;
      }

      function handlePaste(e, cm) {
        var pasted = e.clipboardData && e.clipboardData.getData("Text");
        if (pasted) {
          e.preventDefault();
          if (!cm.isReadOnly() && !cm.options.disableInput) {
            runInOp(cm, function() {
              return applyTextInput(cm, pasted, 0, null, "paste");
            });
          }
          return true
        }
      }

      function triggerElectric(cm, inserted) {
        // When an 'electric' character is inserted, immediately trigger a reindent
        if (!cm.options.electricChars || !cm.options.smartIndent) {
          return
        }
        var sel = cm.doc.sel;

        for (var i = sel.ranges.length - 1; i >= 0; i--) {
          var range$$1 = sel.ranges[i];
          if (range$$1.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range$$1.head.line)) {
            continue
          }
          var mode = cm.getModeAt(range$$1.head);
          var indented = false;
          if (mode.electricChars) {
            for (var j = 0; j < mode.electricChars.length; j++) {
              if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
                indented = indentLine(cm, range$$1.head.line, "smart");
                break
              }
            }
          } else if (mode.electricInput) {
            if (mode.electricInput.test(getLine(cm.doc, range$$1.head.line).text.slice(0, range$$1.head.ch))) {
              indented = indentLine(cm, range$$1.head.line, "smart");
            }
          }
          if (indented) {
            signalLater(cm, "electricInput", cm, range$$1.head.line);
          }
        }
      }

      function copyableRanges(cm) {
        var text = [],
          ranges = [];
        for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
          var line = cm.doc.sel.ranges[i].head.line;
          var lineRange = {
            anchor: Pos(line, 0),
            head: Pos(line + 1, 0)
          };
          ranges.push(lineRange);
          text.push(cm.getRange(lineRange.anchor, lineRange.head));
        }
        return {
          text: text,
          ranges: ranges
        }
      }

      function disableBrowserMagic(field, spellcheck) {
        field.setAttribute("autocorrect", "off");
        field.setAttribute("autocapitalize", "off");
        field.setAttribute("spellcheck", !!spellcheck);
      }

      function hiddenTextarea() {
        var te = elt("textarea", null, null, "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; outline: none");
        var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
        // The textarea is kept positioned near the cursor to prevent the
        // fact that it'll be scrolled into view on input from scrolling
        // our fake cursor out of view. On webkit, when wrap=off, paste is
        // very slow. So make the area wide instead.
        if (webkit) {
          te.style.width = "1000px";
        } else {
          te.setAttribute("wrap", "off");
        }
        // If border: 0; -- iOS fails to open keyboard (issue #1287)
        if (ios) {
          te.style.border = "1px solid black";
        }
        disableBrowserMagic(te);
        return div
      }

      // The publicly visible API. Note that methodOp(f) means
      // 'wrap f in an operation, performed on its `this` parameter'.

      // This is not the complete set of editor methods. Most of the
      // methods defined on the Doc type are also injected into
      // CodeMirror.prototype, for backwards compatibility and
      // convenience.

      var addEditorMethods = function(CodeMirror) {
        var optionHandlers = CodeMirror.optionHandlers;

        var helpers = CodeMirror.helpers = {};

        CodeMirror.prototype = {
          constructor: CodeMirror,
          focus: function() {
            window.focus();
            this.display.input.focus();
          },

          setOption: function(option, value) {
            var options = this.options,
              old = options[option];
            if (options[option] == value && option != "mode") {
              return
            }
            options[option] = value;
            if (optionHandlers.hasOwnProperty(option)) {
              operation(this, optionHandlers[option])(this, value, old);
            }
            signal(this, "optionChange", this, option);
          },

          getOption: function(option) {
            return this.options[option]
          },
          getDoc: function() {
            return this.doc
          },

          addKeyMap: function(map$$1, bottom) {
            this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map$$1));
          },
          removeKeyMap: function(map$$1) {
            var maps = this.state.keyMaps;
            for (var i = 0; i < maps.length; ++i) {
              if (maps[i] == map$$1 || maps[i].name == map$$1) {
                maps.splice(i, 1);
                return true
              }
            }
          },

          addOverlay: methodOp(function(spec, options) {
            var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
            if (mode.startState) {
              throw new Error("Overlays may not be stateful.")
            }
            insertSorted(this.state.overlays, {
                mode: mode,
                modeSpec: spec,
                opaque: options && options.opaque,
                priority: (options && options.priority) || 0
              },
              function(overlay) {
                return overlay.priority;
              });
            this.state.modeGen++;
            regChange(this);
          }),
          removeOverlay: methodOp(function(spec) {
            var this$1 = this;

            var overlays = this.state.overlays;
            for (var i = 0; i < overlays.length; ++i) {
              var cur = overlays[i].modeSpec;
              if (cur == spec || typeof spec == "string" && cur.name == spec) {
                overlays.splice(i, 1);
                this$1.state.modeGen++;
                regChange(this$1);
                return
              }
            }
          }),

          indentLine: methodOp(function(n, dir, aggressive) {
            if (typeof dir != "string" && typeof dir != "number") {
              if (dir == null) {
                dir = this.options.smartIndent ? "smart" : "prev";
              } else {
                dir = dir ? "add" : "subtract";
              }
            }
            if (isLine(this.doc, n)) {
              indentLine(this, n, dir, aggressive);
            }
          }),
          indentSelection: methodOp(function(how) {
            var this$1 = this;

            var ranges = this.doc.sel.ranges,
              end = -1;
            for (var i = 0; i < ranges.length; i++) {
              var range$$1 = ranges[i];
              if (!range$$1.empty()) {
                var from = range$$1.from(),
                  to = range$$1.to();
                var start = Math.max(end, from.line);
                end = Math.min(this$1.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
                for (var j = start; j < end; ++j) {
                  indentLine(this$1, j, how);
                }
                var newRanges = this$1.doc.sel.ranges;
                if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0) {
                  replaceOneSelection(this$1.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll);
                }
              } else if (range$$1.head.line > end) {
                indentLine(this$1, range$$1.head.line, how, true);
                end = range$$1.head.line;
                if (i == this$1.doc.sel.primIndex) {
                  ensureCursorVisible(this$1);
                }
              }
            }
          }),

          // Fetch the parser token for a given character. Useful for hacks
          // that want to inspect the mode state (say, for completion).
          getTokenAt: function(pos, precise) {
            return takeToken(this, pos, precise)
          },

          getLineTokens: function(line, precise) {
            return takeToken(this, Pos(line), precise, true)
          },

          getTokenTypeAt: function(pos) {
            pos = clipPos(this.doc, pos);
            var styles = getLineStyles(this, getLine(this.doc, pos.line));
            var before = 0,
              after = (styles.length - 1) / 2,
              ch = pos.ch;
            var type;
            if (ch == 0) {
              type = styles[2];
            } else {
              for (;;) {
                var mid = (before + after) >> 1;
                if ((mid ? styles[mid * 2 - 1] : 0) >= ch) {
                  after = mid;
                } else if (styles[mid * 2 + 1] < ch) {
                  before = mid + 1;
                } else {
                  type = styles[mid * 2 + 2];
                  break
                }
              }
            }
            var cut = type ? type.indexOf("overlay ") : -1;
            return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)
          },

          getModeAt: function(pos) {
            var mode = this.doc.mode;
            if (!mode.innerMode) {
              return mode
            }
            return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode
          },

          getHelper: function(pos, type) {
            return this.getHelpers(pos, type)[0]
          },

          getHelpers: function(pos, type) {
            var this$1 = this;

            var found = [];
            if (!helpers.hasOwnProperty(type)) {
              return found
            }
            var help = helpers[type],
              mode = this.getModeAt(pos);
            if (typeof mode[type] == "string") {
              if (help[mode[type]]) {
                found.push(help[mode[type]]);
              }
            } else if (mode[type]) {
              for (var i = 0; i < mode[type].length; i++) {
                var val = help[mode[type][i]];
                if (val) {
                  found.push(val);
                }
              }
            } else if (mode.helperType && help[mode.helperType]) {
              found.push(help[mode.helperType]);
            } else if (help[mode.name]) {
              found.push(help[mode.name]);
            }
            for (var i$1 = 0; i$1 < help._global.length; i$1++) {
              var cur = help._global[i$1];
              if (cur.pred(mode, this$1) && indexOf(found, cur.val) == -1) {
                found.push(cur.val);
              }
            }
            return found
          },

          getStateAfter: function(line, precise) {
            var doc = this.doc;
            line = clipLine(doc, line == null ? doc.first + doc.size - 1 : line);
            return getContextBefore(this, line + 1, precise).state
          },

          cursorCoords: function(start, mode) {
            var pos, range$$1 = this.doc.sel.primary();
            if (start == null) {
              pos = range$$1.head;
            } else if (typeof start == "object") {
              pos = clipPos(this.doc, start);
            } else {
              pos = start ? range$$1.from() : range$$1.to();
            }
            return cursorCoords(this, pos, mode || "page")
          },

          charCoords: function(pos, mode) {
            return charCoords(this, clipPos(this.doc, pos), mode || "page")
          },

          coordsChar: function(coords, mode) {
            coords = fromCoordSystem(this, coords, mode || "page");
            return coordsChar(this, coords.left, coords.top)
          },

          lineAtHeight: function(height, mode) {
            height = fromCoordSystem(this, {
              top: height,
              left: 0
            }, mode || "page").top;
            return lineAtHeight(this.doc, height + this.display.viewOffset)
          },
          heightAtLine: function(line, mode, includeWidgets) {
            var end = false,
              lineObj;
            if (typeof line == "number") {
              var last = this.doc.first + this.doc.size - 1;
              if (line < this.doc.first) {
                line = this.doc.first;
              } else if (line > last) {
                line = last;
                end = true;
              }
              lineObj = getLine(this.doc, line);
            } else {
              lineObj = line;
            }
            return intoCoordSystem(this, lineObj, {
                top: 0,
                left: 0
              }, mode || "page", includeWidgets || end).top +
              (end ? this.doc.height - heightAtLine(lineObj) : 0)
          },

          defaultTextHeight: function() {
            return textHeight(this.display)
          },
          defaultCharWidth: function() {
            return charWidth(this.display)
          },

          getViewport: function() {
            return {
              from: this.display.viewFrom,
              to: this.display.viewTo
            }
          },

          addWidget: function(pos, node, scroll, vert, horiz) {
            var display = this.display;
            pos = cursorCoords(this, clipPos(this.doc, pos));
            var top = pos.bottom,
              left = pos.left;
            node.style.position = "absolute";
            node.setAttribute("cm-ignore-events", "true");
            this.display.input.setUneditable(node);
            display.sizer.appendChild(node);
            if (vert == "over") {
              top = pos.top;
            } else if (vert == "above" || vert == "near") {
              var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
                hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
              // Default to positioning above (if specified and possible); otherwise default to positioning below
              if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight) {
                top = pos.top - node.offsetHeight;
              } else if (pos.bottom + node.offsetHeight <= vspace) {
                top = pos.bottom;
              }
              if (left + node.offsetWidth > hspace) {
                left = hspace - node.offsetWidth;
              }
            }
            node.style.top = top + "px";
            node.style.left = node.style.right = "";
            if (horiz == "right") {
              left = display.sizer.clientWidth - node.offsetWidth;
              node.style.right = "0px";
            } else {
              if (horiz == "left") {
                left = 0;
              } else if (horiz == "middle") {
                left = (display.sizer.clientWidth - node.offsetWidth) / 2;
              }
              node.style.left = left + "px";
            }
            if (scroll) {
              scrollIntoView(this, {
                left: left,
                top: top,
                right: left + node.offsetWidth,
                bottom: top + node.offsetHeight
              });
            }
          },

          triggerOnKeyDown: methodOp(onKeyDown),
          triggerOnKeyPress: methodOp(onKeyPress),
          triggerOnKeyUp: onKeyUp,
          triggerOnMouseDown: methodOp(onMouseDown),

          execCommand: function(cmd) {
            if (commands.hasOwnProperty(cmd)) {
              return commands[cmd].call(null, this)
            }
          },

          triggerElectric: methodOp(function(text) {
            triggerElectric(this, text);
          }),

          findPosH: function(from, amount, unit, visually) {
            var this$1 = this;

            var dir = 1;
            if (amount < 0) {
              dir = -1;
              amount = -amount;
            }
            var cur = clipPos(this.doc, from);
            for (var i = 0; i < amount; ++i) {
              cur = findPosH(this$1.doc, cur, dir, unit, visually);
              if (cur.hitSide) {
                break
              }
            }
            return cur
          },

          moveH: methodOp(function(dir, unit) {
            var this$1 = this;

            this.extendSelectionsBy(function(range$$1) {
              if (this$1.display.shift || this$1.doc.extend || range$$1.empty()) {
                return findPosH(this$1.doc, range$$1.head, dir, unit, this$1.options.rtlMoveVisually)
              } else {
                return dir < 0 ? range$$1.from() : range$$1.to()
              }
            }, sel_move);
          }),

          deleteH: methodOp(function(dir, unit) {
            var sel = this.doc.sel,
              doc = this.doc;
            if (sel.somethingSelected()) {
              doc.replaceSelection("", null, "+delete");
            } else {
              deleteNearSelection(this, function(range$$1) {
                var other = findPosH(doc, range$$1.head, dir, unit, false);
                return dir < 0 ? {
                  from: other,
                  to: range$$1.head
                } : {
                  from: range$$1.head,
                  to: other
                }
              });
            }
          }),

          findPosV: function(from, amount, unit, goalColumn) {
            var this$1 = this;

            var dir = 1,
              x = goalColumn;
            if (amount < 0) {
              dir = -1;
              amount = -amount;
            }
            var cur = clipPos(this.doc, from);
            for (var i = 0; i < amount; ++i) {
              var coords = cursorCoords(this$1, cur, "div");
              if (x == null) {
                x = coords.left;
              } else {
                coords.left = x;
              }
              cur = findPosV(this$1, coords, dir, unit);
              if (cur.hitSide) {
                break
              }
            }
            return cur
          },

          moveV: methodOp(function(dir, unit) {
            var this$1 = this;

            var doc = this.doc,
              goals = [];
            var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected();
            doc.extendSelectionsBy(function(range$$1) {
              if (collapse) {
                return dir < 0 ? range$$1.from() : range$$1.to()
              }
              var headPos = cursorCoords(this$1, range$$1.head, "div");
              if (range$$1.goalColumn != null) {
                headPos.left = range$$1.goalColumn;
              }
              goals.push(headPos.left);
              var pos = findPosV(this$1, headPos, dir, unit);
              if (unit == "page" && range$$1 == doc.sel.primary()) {
                addToScrollTop(this$1, charCoords(this$1, pos, "div").top - headPos.top);
              }
              return pos
            }, sel_move);
            if (goals.length) {
              for (var i = 0; i < doc.sel.ranges.length; i++) {
                doc.sel.ranges[i].goalColumn = goals[i];
              }
            }
          }),

          // Find the word at the given position (as returned by coordsChar).
          findWordAt: function(pos) {
            var doc = this.doc,
              line = getLine(doc, pos.line).text;
            var start = pos.ch,
              end = pos.ch;
            if (line) {
              var helper = this.getHelper(pos, "wordChars");
              if ((pos.sticky == "before" || end == line.length) && start) {
                --start;
              } else {
                ++end;
              }
              var startChar = line.charAt(start);
              var check = isWordChar(startChar, helper) ?
                function(ch) {
                  return isWordChar(ch, helper);
                } :
                /\s/.test(startChar) ? function(ch) {
                  return /\s/.test(ch);
                } :
                function(ch) {
                  return (!/\s/.test(ch) && !isWordChar(ch));
                };
              while (start > 0 && check(line.charAt(start - 1))) {
                --start;
              }
              while (end < line.length && check(line.charAt(end))) {
                ++end;
              }
            }
            return new Range(Pos(pos.line, start), Pos(pos.line, end))
          },

          toggleOverwrite: function(value) {
            if (value != null && value == this.state.overwrite) {
              return
            }
            if (this.state.overwrite = !this.state.overwrite) {
              addClass(this.display.cursorDiv, "CodeMirror-overwrite");
            } else {
              rmClass(this.display.cursorDiv, "CodeMirror-overwrite");
            }

            signal(this, "overwriteToggle", this, this.state.overwrite);
          },
          hasFocus: function() {
            return this.display.input.getField() == activeElt()
          },
          isReadOnly: function() {
            return !!(this.options.readOnly || this.doc.cantEdit)
          },

          scrollTo: methodOp(function(x, y) {
            scrollToCoords(this, x, y);
          }),
          getScrollInfo: function() {
            var scroller = this.display.scroller;
            return {
              left: scroller.scrollLeft,
              top: scroller.scrollTop,
              height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
              width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
              clientHeight: displayHeight(this),
              clientWidth: displayWidth(this)
            }
          },

          scrollIntoView: methodOp(function(range$$1, margin) {
            if (range$$1 == null) {
              range$$1 = {
                from: this.doc.sel.primary().head,
                to: null
              };
              if (margin == null) {
                margin = this.options.cursorScrollMargin;
              }
            } else if (typeof range$$1 == "number") {
              range$$1 = {
                from: Pos(range$$1, 0),
                to: null
              };
            } else if (range$$1.from == null) {
              range$$1 = {
                from: range$$1,
                to: null
              };
            }
            if (!range$$1.to) {
              range$$1.to = range$$1.from;
            }
            range$$1.margin = margin || 0;

            if (range$$1.from.line != null) {
              scrollToRange(this, range$$1);
            } else {
              scrollToCoordsRange(this, range$$1.from, range$$1.to, range$$1.margin);
            }
          }),

          setSize: methodOp(function(width, height) {
            var this$1 = this;

            var interpret = function(val) {
              return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val;
            };
            if (width != null) {
              this.display.wrapper.style.width = interpret(width);
            }
            if (height != null) {
              this.display.wrapper.style.height = interpret(height);
            }
            if (this.options.lineWrapping) {
              clearLineMeasurementCache(this);
            }
            var lineNo$$1 = this.display.viewFrom;
            this.doc.iter(lineNo$$1, this.display.viewTo, function(line) {
              if (line.widgets) {
                for (var i = 0; i < line.widgets.length; i++) {
                  if (line.widgets[i].noHScroll) {
                    regLineChange(this$1, lineNo$$1, "widget");
                    break
                  }
                }
              }
              ++lineNo$$1;
            });
            this.curOp.forceUpdate = true;
            signal(this, "refresh", this);
          }),

          operation: function(f) {
            return runInOp(this, f)
          },
          startOperation: function() {
            return startOperation(this)
          },
          endOperation: function() {
            return endOperation(this)
          },

          refresh: methodOp(function() {
            var oldHeight = this.display.cachedTextHeight;
            regChange(this);
            this.curOp.forceUpdate = true;
            clearCaches(this);
            scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop);
            updateGutterSpace(this);
            if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5) {
              estimateLineHeights(this);
            }
            signal(this, "refresh", this);
          }),

          swapDoc: methodOp(function(doc) {
            var old = this.doc;
            old.cm = null;
            attachDoc(this, doc);
            clearCaches(this);
            this.display.input.reset();
            scrollToCoords(this, doc.scrollLeft, doc.scrollTop);
            this.curOp.forceScroll = true;
            signalLater(this, "swapDoc", this, old);
            return old
          }),

          getInputField: function() {
            return this.display.input.getField()
          },
          getWrapperElement: function() {
            return this.display.wrapper
          },
          getScrollerElement: function() {
            return this.display.scroller
          },
          getGutterElement: function() {
            return this.display.gutters
          }
        };
        eventMixin(CodeMirror);

        CodeMirror.registerHelper = function(type, name, value) {
          if (!helpers.hasOwnProperty(type)) {
            helpers[type] = CodeMirror[type] = {
              _global: []
            };
          }
          helpers[type][name] = value;
        };
        CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {
          CodeMirror.registerHelper(type, name, value);
          helpers[type]._global.push({
            pred: predicate,
            val: value
          });
        };
      };

      // Used for horizontal relative motion. Dir is -1 or 1 (left or
      // right), unit can be "char", "column" (like char, but doesn't
      // cross line boundaries), "word" (across next word), or "group" (to
      // the start of next group of word or non-word-non-whitespace
      // chars). The visually param controls whether, in right-to-left
      // text, direction 1 means to move towards the next index in the
      // string, or towards the character to the right of the current
      // position. The resulting position will have a hitSide=true
      // property if it reached the end of the document.
      function findPosH(doc, pos, dir, unit, visually) {
        var oldPos = pos;
        var origDir = dir;
        var lineObj = getLine(doc, pos.line);

        function findNextLine() {
          var l = pos.line + dir;
          if (l < doc.first || l >= doc.first + doc.size) {
            return false
          }
          pos = new Pos(l, pos.ch, pos.sticky);
          return lineObj = getLine(doc, l)
        }

        function moveOnce(boundToLine) {
          var next;
          if (visually) {
            next = moveVisually(doc.cm, lineObj, pos, dir);
          } else {
            next = moveLogically(lineObj, pos, dir);
          }
          if (next == null) {
            if (!boundToLine && findNextLine()) {
              pos = endOfLine(visually, doc.cm, lineObj, pos.line, dir);
            } else {
              return false
            }
          } else {
            pos = next;
          }
          return true
        }

        if (unit == "char") {
          moveOnce();
        } else if (unit == "column") {
          moveOnce(true);
        } else if (unit == "word" || unit == "group") {
          var sawType = null,
            group = unit == "group";
          var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
          for (var first = true;; first = false) {
            if (dir < 0 && !moveOnce(!first)) {
              break
            }
            var cur = lineObj.text.charAt(pos.ch) || "\n";
            var type = isWordChar(cur, helper) ? "w" :
              group && cur == "\n" ? "n" :
              !group || /\s/.test(cur) ? null :
              "p";
            if (group && !first && !type) {
              type = "s";
            }
            if (sawType && sawType != type) {
              if (dir < 0) {
                dir = 1;
                moveOnce();
                pos.sticky = "after";
              }
              break
            }

            if (type) {
              sawType = type;
            }
            if (dir > 0 && !moveOnce(!first)) {
              break
            }
          }
        }
        var result = skipAtomic(doc, pos, oldPos, origDir, true);
        if (equalCursorPos(oldPos, result)) {
          result.hitSide = true;
        }
        return result
      }

      // For relative vertical movement. Dir may be -1 or 1. Unit can be
      // "page" or "line". The resulting position will have a hitSide=true
      // property if it reached the end of the document.
      function findPosV(cm, pos, dir, unit) {
        var doc = cm.doc,
          x = pos.left,
          y;
        if (unit == "page") {
          var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
          var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3);
          y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount;

        } else if (unit == "line") {
          y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
        }
        var target;
        for (;;) {
          target = coordsChar(cm, x, y);
          if (!target.outside) {
            break
          }
          if (dir < 0 ? y <= 0 : y >= doc.height) {
            target.hitSide = true;
            break
          }
          y += dir * 5;
        }
        return target
      }

      // CONTENTEDITABLE INPUT STYLE

      var ContentEditableInput = function(cm) {
        this.cm = cm;
        this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;
        this.polling = new Delayed();
        this.composing = null;
        this.gracePeriod = false;
        this.readDOMTimeout = null;
      };

      ContentEditableInput.prototype.init = function(display) {
        var this$1 = this;

        var input = this,
          cm = input.cm;
        var div = input.div = display.lineDiv;
        disableBrowserMagic(div, cm.options.spellcheck);

        on(div, "paste", function(e) {
          if (signalDOMEvent(cm, e) || handlePaste(e, cm)) {
            return
          }
          // IE doesn't fire input events, so we schedule a read for the pasted content in this way
          if (ie_version <= 11) {
            setTimeout(operation(cm, function() {
              return this$1.updateFromDOM();
            }), 20);
          }
        });

        on(div, "compositionstart", function(e) {
          this$1.composing = {
            data: e.data,
            done: false
          };
        });
        on(div, "compositionupdate", function(e) {
          if (!this$1.composing) {
            this$1.composing = {
              data: e.data,
              done: false
            };
          }
        });
        on(div, "compositionend", function(e) {
          if (this$1.composing) {
            if (e.data != this$1.composing.data) {
              this$1.readFromDOMSoon();
            }
            this$1.composing.done = true;
          }
        });

        on(div, "touchstart", function() {
          return input.forceCompositionEnd();
        });

        on(div, "input", function() {
          if (!this$1.composing) {
            this$1.readFromDOMSoon();
          }
        });

        function onCopyCut(e) {
          if (signalDOMEvent(cm, e)) {
            return
          }
          if (cm.somethingSelected()) {
            setLastCopied({
              lineWise: false,
              text: cm.getSelections()
            });
            if (e.type == "cut") {
              cm.replaceSelection("", null, "cut");
            }
          } else if (!cm.options.lineWiseCopyCut) {
            return
          } else {
            var ranges = copyableRanges(cm);
            setLastCopied({
              lineWise: true,
              text: ranges.text
            });
            if (e.type == "cut") {
              cm.operation(function() {
                cm.setSelections(ranges.ranges, 0, sel_dontScroll);
                cm.replaceSelection("", null, "cut");
              });
            }
          }
          if (e.clipboardData) {
            e.clipboardData.clearData();
            var content = lastCopied.text.join("\n");
            // iOS exposes the clipboard API, but seems to discard content inserted into it
            e.clipboardData.setData("Text", content);
            if (e.clipboardData.getData("Text") == content) {
              e.preventDefault();
              return
            }
          }
          // Old-fashioned briefly-focus-a-textarea hack
          var kludge = hiddenTextarea(),
            te = kludge.firstChild;
          cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);
          te.value = lastCopied.text.join("\n");
          var hadFocus = document.activeElement;
          selectInput(te);
          setTimeout(function() {
            cm.display.lineSpace.removeChild(kludge);
            hadFocus.focus();
            if (hadFocus == div) {
              input.showPrimarySelection();
            }
          }, 50);
        }
        on(div, "copy", onCopyCut);
        on(div, "cut", onCopyCut);
      };

      ContentEditableInput.prototype.prepareSelection = function() {
        var result = prepareSelection(this.cm, false);
        result.focus = this.cm.state.focused;
        return result
      };

      ContentEditableInput.prototype.showSelection = function(info, takeFocus) {
        if (!info || !this.cm.display.view.length) {
          return
        }
        if (info.focus || takeFocus) {
          this.showPrimarySelection();
        }
        this.showMultipleSelections(info);
      };

      ContentEditableInput.prototype.showPrimarySelection = function() {
        var sel = window.getSelection(),
          cm = this.cm,
          prim = cm.doc.sel.primary();
        var from = prim.from(),
          to = prim.to();

        if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {
          sel.removeAllRanges();
          return
        }

        var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
        var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset);
        if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
          cmp(minPos(curAnchor, curFocus), from) == 0 &&
          cmp(maxPos(curAnchor, curFocus), to) == 0) {
          return
        }

        var view = cm.display.view;
        var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) || {
          node: view[0].measure.map[2],
          offset: 0
        };
        var end = to.line < cm.display.viewTo && posToDOM(cm, to);
        if (!end) {
          var measure = view[view.length - 1].measure;
          var map$$1 = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;
          end = {
            node: map$$1[map$$1.length - 1],
            offset: map$$1[map$$1.length - 2] - map$$1[map$$1.length - 3]
          };
        }

        if (!start || !end) {
          sel.removeAllRanges();
          return
        }

        var old = sel.rangeCount && sel.getRangeAt(0),
          rng;
        try {
          rng = range(start.node, start.offset, end.offset, end.node);
        } catch (e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
        if (rng) {
          if (!gecko && cm.state.focused) {
            sel.collapse(start.node, start.offset);
            if (!rng.collapsed) {
              sel.removeAllRanges();
              sel.addRange(rng);
            }
          } else {
            sel.removeAllRanges();
            sel.addRange(rng);
          }
          if (old && sel.anchorNode == null) {
            sel.addRange(old);
          } else if (gecko) {
            this.startGracePeriod();
          }
        }
        this.rememberSelection();
      };

      ContentEditableInput.prototype.startGracePeriod = function() {
        var this$1 = this;

        clearTimeout(this.gracePeriod);
        this.gracePeriod = setTimeout(function() {
          this$1.gracePeriod = false;
          if (this$1.selectionChanged()) {
            this$1.cm.operation(function() {
              return this$1.cm.curOp.selectionChanged = true;
            });
          }
        }, 20);
      };

      ContentEditableInput.prototype.showMultipleSelections = function(info) {
        removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
        removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
      };

      ContentEditableInput.prototype.rememberSelection = function() {
        var sel = window.getSelection();
        this.lastAnchorNode = sel.anchorNode;
        this.lastAnchorOffset = sel.anchorOffset;
        this.lastFocusNode = sel.focusNode;
        this.lastFocusOffset = sel.focusOffset;
      };

      ContentEditableInput.prototype.selectionInEditor = function() {
        var sel = window.getSelection();
        if (!sel.rangeCount) {
          return false
        }
        var node = sel.getRangeAt(0).commonAncestorContainer;
        return contains(this.div, node)
      };

      ContentEditableInput.prototype.focus = function() {
        if (this.cm.options.readOnly != "nocursor") {
          if (!this.selectionInEditor()) {
            this.showSelection(this.prepareSelection(), true);
          }
          this.div.focus();
        }
      };
      ContentEditableInput.prototype.blur = function() {
        this.div.blur();
      };
      ContentEditableInput.prototype.getField = function() {
        return this.div
      };

      ContentEditableInput.prototype.supportsTouch = function() {
        return true
      };

      ContentEditableInput.prototype.receivedFocus = function() {
        var input = this;
        if (this.selectionInEditor()) {
          this.pollSelection();
        } else {
          runInOp(this.cm, function() {
            return input.cm.curOp.selectionChanged = true;
          });
        }

        function poll() {
          if (input.cm.state.focused) {
            input.pollSelection();
            input.polling.set(input.cm.options.pollInterval, poll);
          }
        }
        this.polling.set(this.cm.options.pollInterval, poll);
      };

      ContentEditableInput.prototype.selectionChanged = function() {
        var sel = window.getSelection();
        return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
          sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset
      };

      ContentEditableInput.prototype.pollSelection = function() {
        if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) {
          return
        }
        var sel = window.getSelection(),
          cm = this.cm;
        // On Android Chrome (version 56, at least), backspacing into an
        // uneditable block element will put the cursor in that element,
        // and then, because it's not editable, hide the virtual keyboard.
        // Because Android doesn't allow us to actually detect backspace
        // presses in a sane way, this code checks for when that happens
        // and simulates a backspace press in this case.
        if (android && chrome && this.cm.options.gutters.length && isInGutter(sel.anchorNode)) {
          this.cm.triggerOnKeyDown({
            type: "keydown",
            keyCode: 8,
            preventDefault: Math.abs
          });
          this.blur();
          this.focus();
          return
        }
        if (this.composing) {
          return
        }
        this.rememberSelection();
        var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
        var head = domToPos(cm, sel.focusNode, sel.focusOffset);
        if (anchor && head) {
          runInOp(cm, function() {
            setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
            if (anchor.bad || head.bad) {
              cm.curOp.selectionChanged = true;
            }
          });
        }
      };

      ContentEditableInput.prototype.pollContent = function() {
        if (this.readDOMTimeout != null) {
          clearTimeout(this.readDOMTimeout);
          this.readDOMTimeout = null;
        }

        var cm = this.cm,
          display = cm.display,
          sel = cm.doc.sel.primary();
        var from = sel.from(),
          to = sel.to();
        if (from.ch == 0 && from.line > cm.firstLine()) {
          from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length);
        }
        if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine()) {
          to = Pos(to.line + 1, 0);
        }
        if (from.line < display.viewFrom || to.line > display.viewTo - 1) {
          return false
        }

        var fromIndex, fromLine, fromNode;
        if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
          fromLine = lineNo(display.view[0].line);
          fromNode = display.view[0].node;
        } else {
          fromLine = lineNo(display.view[fromIndex].line);
          fromNode = display.view[fromIndex - 1].node.nextSibling;
        }
        var toIndex = findViewIndex(cm, to.line);
        var toLine, toNode;
        if (toIndex == display.view.length - 1) {
          toLine = display.viewTo - 1;
          toNode = display.lineDiv.lastChild;
        } else {
          toLine = lineNo(display.view[toIndex + 1].line) - 1;
          toNode = display.view[toIndex + 1].node.previousSibling;
        }

        if (!fromNode) {
          return false
        }
        var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));
        var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));
        while (newText.length > 1 && oldText.length > 1) {
          if (lst(newText) == lst(oldText)) {
            newText.pop();
            oldText.pop();
            toLine--;
          } else if (newText[0] == oldText[0]) {
            newText.shift();
            oldText.shift();
            fromLine++;
          } else {
            break
          }
        }

        var cutFront = 0,
          cutEnd = 0;
        var newTop = newText[0],
          oldTop = oldText[0],
          maxCutFront = Math.min(newTop.length, oldTop.length);
        while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront)) {
          ++cutFront;
        }
        var newBot = lst(newText),
          oldBot = lst(oldText);
        var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
          oldBot.length - (oldText.length == 1 ? cutFront : 0));
        while (cutEnd < maxCutEnd &&
          newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
          ++cutEnd;
        }
        // Try to move start of change to start of selection if ambiguous
        if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {
          while (cutFront && cutFront > from.ch &&
            newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
            cutFront--;
            cutEnd++;
          }
        }

        newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\u200b+/, "");
        newText[0] = newText[0].slice(cutFront).replace(/\u200b+$/, "");

        var chFrom = Pos(fromLine, cutFront);
        var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
        if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
          replaceRange(cm.doc, newText, chFrom, chTo, "+input");
          return true
        }
      };

      ContentEditableInput.prototype.ensurePolled = function() {
        this.forceCompositionEnd();
      };
      ContentEditableInput.prototype.reset = function() {
        this.forceCompositionEnd();
      };
      ContentEditableInput.prototype.forceCompositionEnd = function() {
        if (!this.composing) {
          return
        }
        clearTimeout(this.readDOMTimeout);
        this.composing = null;
        this.updateFromDOM();
        this.div.blur();
        this.div.focus();
      };
      ContentEditableInput.prototype.readFromDOMSoon = function() {
        var this$1 = this;

        if (this.readDOMTimeout != null) {
          return
        }
        this.readDOMTimeout = setTimeout(function() {
          this$1.readDOMTimeout = null;
          if (this$1.composing) {
            if (this$1.composing.done) {
              this$1.composing = null;
            } else {
              return
            }
          }
          this$1.updateFromDOM();
        }, 80);
      };

      ContentEditableInput.prototype.updateFromDOM = function() {
        var this$1 = this;

        if (this.cm.isReadOnly() || !this.pollContent()) {
          runInOp(this.cm, function() {
            return regChange(this$1.cm);
          });
        }
      };

      ContentEditableInput.prototype.setUneditable = function(node) {
        node.contentEditable = "false";
      };

      ContentEditableInput.prototype.onKeyPress = function(e) {
        if (e.charCode == 0) {
          return
        }
        e.preventDefault();
        if (!this.cm.isReadOnly()) {
          operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0);
        }
      };

      ContentEditableInput.prototype.readOnlyChanged = function(val) {
        this.div.contentEditable = String(val != "nocursor");
      };

      ContentEditableInput.prototype.onContextMenu = function() {};
      ContentEditableInput.prototype.resetPosition = function() {};

      ContentEditableInput.prototype.needsContentAttribute = true;

      function posToDOM(cm, pos) {
        var view = findViewForLine(cm, pos.line);
        if (!view || view.hidden) {
          return null
        }
        var line = getLine(cm.doc, pos.line);
        var info = mapFromLineView(view, line, pos.line);

        var order = getOrder(line, cm.doc.direction),
          side = "left";
        if (order) {
          var partPos = getBidiPartAt(order, pos.ch);
          side = partPos % 2 ? "right" : "left";
        }
        var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
        result.offset = result.collapse == "right" ? result.end : result.start;
        return result
      }

      function isInGutter(node) {
        for (var scan = node; scan; scan = scan.parentNode) {
          if (/CodeMirror-gutter-wrapper/.test(scan.className)) {
            return true
          }
        }
        return false
      }

      function badPos(pos, bad) {
        if (bad) {
          pos.bad = true;
        }
        return pos
      }

      function domTextBetween(cm, from, to, fromLine, toLine) {
        var text = "",
          closing = false,
          lineSep = cm.doc.lineSeparator();

        function recognizeMarker(id) {
          return function(marker) {
            return marker.id == id;
          }
        }

        function close() {
          if (closing) {
            text += lineSep;
            closing = false;
          }
        }

        function addText(str) {
          if (str) {
            close();
            text += str;
          }
        }

        function walk(node) {
          if (node.nodeType == 1) {
            var cmText = node.getAttribute("cm-text");
            if (cmText != null) {
              addText(cmText || node.textContent.replace(/\u200b/g, ""));
              return
            }
            var markerID = node.getAttribute("cm-marker"),
              range$$1;
            if (markerID) {
              var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));
              if (found.length && (range$$1 = found[0].find(0))) {
                addText(getBetween(cm.doc, range$$1.from, range$$1.to).join(lineSep));
              }
              return
            }
            if (node.getAttribute("contenteditable") == "false") {
              return
            }
            var isBlock = /^(pre|div|p)$/i.test(node.nodeName);
            if (isBlock) {
              close();
            }
            for (var i = 0; i < node.childNodes.length; i++) {
              walk(node.childNodes[i]);
            }
            if (isBlock) {
              closing = true;
            }
          } else if (node.nodeType == 3) {
            addText(node.nodeValue);
          }
        }
        for (;;) {
          walk(from);
          if (from == to) {
            break
          }
          from = from.nextSibling;
        }
        return text
      }

      function domToPos(cm, node, offset) {
        var lineNode;
        if (node == cm.display.lineDiv) {
          lineNode = cm.display.lineDiv.childNodes[offset];
          if (!lineNode) {
            return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true)
          }
          node = null;
          offset = 0;
        } else {
          for (lineNode = node;; lineNode = lineNode.parentNode) {
            if (!lineNode || lineNode == cm.display.lineDiv) {
              return null
            }
            if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) {
              break
            }
          }
        }
        for (var i = 0; i < cm.display.view.length; i++) {
          var lineView = cm.display.view[i];
          if (lineView.node == lineNode) {
            return locateNodeInLineView(lineView, node, offset)
          }
        }
      }

      function locateNodeInLineView(lineView, node, offset) {
        var wrapper = lineView.text.firstChild,
          bad = false;
        if (!node || !contains(wrapper, node)) {
          return badPos(Pos(lineNo(lineView.line), 0), true)
        }
        if (node == wrapper) {
          bad = true;
          node = wrapper.childNodes[offset];
          offset = 0;
          if (!node) {
            var line = lineView.rest ? lst(lineView.rest) : lineView.line;
            return badPos(Pos(lineNo(line), line.text.length), bad)
          }
        }

        var textNode = node.nodeType == 3 ? node : null,
          topNode = node;
        if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
          textNode = node.firstChild;
          if (offset) {
            offset = textNode.nodeValue.length;
          }
        }
        while (topNode.parentNode != wrapper) {
          topNode = topNode.parentNode;
        }
        var measure = lineView.measure,
          maps = measure.maps;

        function find(textNode, topNode, offset) {
          for (var i = -1; i < (maps ? maps.length : 0); i++) {
            var map$$1 = i < 0 ? measure.map : maps[i];
            for (var j = 0; j < map$$1.length; j += 3) {
              var curNode = map$$1[j + 2];
              if (curNode == textNode || curNode == topNode) {
                var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
                var ch = map$$1[j] + offset;
                if (offset < 0 || curNode != textNode) {
                  ch = map$$1[j + (offset ? 1 : 0)];
                }
                return Pos(line, ch)
              }
            }
          }
        }
        var found = find(textNode, topNode, offset);
        if (found) {
          return badPos(found, bad)
        }

        // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
        for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
          found = find(after, after.firstChild, 0);
          if (found) {
            return badPos(Pos(found.line, found.ch - dist), bad)
          } else {
            dist += after.textContent.length;
          }
        }
        for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {
          found = find(before, before.firstChild, -1);
          if (found) {
            return badPos(Pos(found.line, found.ch + dist$1), bad)
          } else {
            dist$1 += before.textContent.length;
          }
        }
      }

      // TEXTAREA INPUT STYLE

      var TextareaInput = function(cm) {
        this.cm = cm;
        // See input.poll and input.reset
        this.prevInput = "";

        // Flag that indicates whether we expect input to appear real soon
        // now (after some event like 'keypress' or 'input') and are
        // polling intensively.
        this.pollingFast = false;
        // Self-resetting timeout for the poller
        this.polling = new Delayed();
        // Used to work around IE issue with selection being forgotten when focus moves away from textarea
        this.hasSelection = false;
        this.composing = null;
      };

      TextareaInput.prototype.init = function(display) {
        var this$1 = this;

        var input = this,
          cm = this.cm;

        // Wraps and hides input textarea
        var div = this.wrapper = hiddenTextarea();
        // The semihidden textarea that is focused when the editor is
        // focused, and receives input.
        var te = this.textarea = div.firstChild;
        display.wrapper.insertBefore(div, display.wrapper.firstChild);

        // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
        if (ios) {
          te.style.width = "0px";
        }

        on(te, "input", function() {
          if (ie && ie_version >= 9 && this$1.hasSelection) {
            this$1.hasSelection = null;
          }
          input.poll();
        });

        on(te, "paste", function(e) {
          if (signalDOMEvent(cm, e) || handlePaste(e, cm)) {
            return
          }

          cm.state.pasteIncoming = true;
          input.fastPoll();
        });

        function prepareCopyCut(e) {
          if (signalDOMEvent(cm, e)) {
            return
          }
          if (cm.somethingSelected()) {
            setLastCopied({
              lineWise: false,
              text: cm.getSelections()
            });
          } else if (!cm.options.lineWiseCopyCut) {
            return
          } else {
            var ranges = copyableRanges(cm);
            setLastCopied({
              lineWise: true,
              text: ranges.text
            });
            if (e.type == "cut") {
              cm.setSelections(ranges.ranges, null, sel_dontScroll);
            } else {
              input.prevInput = "";
              te.value = ranges.text.join("\n");
              selectInput(te);
            }
          }
          if (e.type == "cut") {
            cm.state.cutIncoming = true;
          }
        }
        on(te, "cut", prepareCopyCut);
        on(te, "copy", prepareCopyCut);

        on(display.scroller, "paste", function(e) {
          if (eventInWidget(display, e) || signalDOMEvent(cm, e)) {
            return
          }
          cm.state.pasteIncoming = true;
          input.focus();
        });

        // Prevent normal selection in the editor (we handle our own)
        on(display.lineSpace, "selectstart", function(e) {
          if (!eventInWidget(display, e)) {
            e_preventDefault(e);
          }
        });

        on(te, "compositionstart", function() {
          var start = cm.getCursor("from");
          if (input.composing) {
            input.composing.range.clear();
          }
          input.composing = {
            start: start,
            range: cm.markText(start, cm.getCursor("to"), {
              className: "CodeMirror-composing"
            })
          };
        });
        on(te, "compositionend", function() {
          if (input.composing) {
            input.poll();
            input.composing.range.clear();
            input.composing = null;
          }
        });
      };

      TextareaInput.prototype.prepareSelection = function() {
        // Redraw the selection and/or cursor
        var cm = this.cm,
          display = cm.display,
          doc = cm.doc;
        var result = prepareSelection(cm);

        // Move the hidden textarea near the cursor to prevent scrolling artifacts
        if (cm.options.moveInputWithCursor) {
          var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
          var wrapOff = display.wrapper.getBoundingClientRect(),
            lineOff = display.lineDiv.getBoundingClientRect();
          result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
            headPos.top + lineOff.top - wrapOff.top));
          result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
            headPos.left + lineOff.left - wrapOff.left));
        }

        return result
      };

      TextareaInput.prototype.showSelection = function(drawn) {
        var cm = this.cm,
          display = cm.display;
        removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
        removeChildrenAndAdd(display.selectionDiv, drawn.selection);
        if (drawn.teTop != null) {
          this.wrapper.style.top = drawn.teTop + "px";
          this.wrapper.style.left = drawn.teLeft + "px";
        }
      };

      // Reset the input to correspond to the selection (or to be empty,
      // when not typing and nothing is selected)
      TextareaInput.prototype.reset = function(typing) {
        if (this.contextMenuPending || this.composing) {
          return
        }
        var cm = this.cm;
        if (cm.somethingSelected()) {
          this.prevInput = "";
          var content = cm.getSelection();
          this.textarea.value = content;
          if (cm.state.focused) {
            selectInput(this.textarea);
          }
          if (ie && ie_version >= 9) {
            this.hasSelection = content;
          }
        } else if (!typing) {
          this.prevInput = this.textarea.value = "";
          if (ie && ie_version >= 9) {
            this.hasSelection = null;
          }
        }
      };

      TextareaInput.prototype.getField = function() {
        return this.textarea
      };

      TextareaInput.prototype.supportsTouch = function() {
        return false
      };

      TextareaInput.prototype.focus = function() {
        if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {
          try {
            this.textarea.focus();
          } catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
        }
      };

      TextareaInput.prototype.blur = function() {
        this.textarea.blur();
      };

      TextareaInput.prototype.resetPosition = function() {
        this.wrapper.style.top = this.wrapper.style.left = 0;
      };

      TextareaInput.prototype.receivedFocus = function() {
        this.slowPoll();
      };

      // Poll for input changes, using the normal rate of polling. This
      // runs as long as the editor is focused.
      TextareaInput.prototype.slowPoll = function() {
        var this$1 = this;

        if (this.pollingFast) {
          return
        }
        this.polling.set(this.cm.options.pollInterval, function() {
          this$1.poll();
          if (this$1.cm.state.focused) {
            this$1.slowPoll();
          }
        });
      };

      // When an event has just come in that is likely to add or change
      // something in the input textarea, we poll faster, to ensure that
      // the change appears on the screen quickly.
      TextareaInput.prototype.fastPoll = function() {
        var missed = false,
          input = this;
        input.pollingFast = true;

        function p() {
          var changed = input.poll();
          if (!changed && !missed) {
            missed = true;
            input.polling.set(60, p);
          } else {
            input.pollingFast = false;
            input.slowPoll();
          }
        }
        input.polling.set(20, p);
      };

      // Read input from the textarea, and update the document to match.
      // When something is selected, it is present in the textarea, and
      // selected (unless it is huge, in which case a placeholder is
      // used). When nothing is selected, the cursor sits after previously
      // seen text (can be empty), which is stored in prevInput (we must
      // not reset the textarea when typing, because that breaks IME).
      TextareaInput.prototype.poll = function() {
        var this$1 = this;

        var cm = this.cm,
          input = this.textarea,
          prevInput = this.prevInput;
        // Since this is called a *lot*, try to bail out as cheaply as
        // possible when it is clear that nothing happened. hasSelection
        // will be the case when there is a lot of text in the textarea,
        // in which case reading its value would be expensive.
        if (this.contextMenuPending || !cm.state.focused ||
          (hasSelection(input) && !prevInput && !this.composing) ||
          cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq) {
          return false
        }

        var text = input.value;
        // If nothing changed, bail.
        if (text == prevInput && !cm.somethingSelected()) {
          return false
        }
        // Work around nonsensical selection resetting in IE9/10, and
        // inexplicable appearance of private area unicode characters on
        // some key combos in Mac (#2689).
        if (ie && ie_version >= 9 && this.hasSelection === text ||
          mac && /[\uf700-\uf7ff]/.test(text)) {
          cm.display.input.reset();
          return false
        }

        if (cm.doc.sel == cm.display.selForContextMenu) {
          var first = text.charCodeAt(0);
          if (first == 0x200b && !prevInput) {
            prevInput = "\u200b";
          }
          if (first == 0x21da) {
            this.reset();
            return this.cm.execCommand("undo")
          }
        }
        // Find the part of the input that is actually new
        var same = 0,
          l = Math.min(prevInput.length, text.length);
        while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) {
          ++same;
        }

        runInOp(cm, function() {
          applyTextInput(cm, text.slice(same), prevInput.length - same,
            null, this$1.composing ? "*compose" : null);

          // Don't leave long text in the textarea, since it makes further polling slow
          if (text.length > 1000 || text.indexOf("\n") > -1) {
            input.value = this$1.prevInput = "";
          } else {
            this$1.prevInput = text;
          }

          if (this$1.composing) {
            this$1.composing.range.clear();
            this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor("to"), {
              className: "CodeMirror-composing"
            });
          }
        });
        return true
      };

      TextareaInput.prototype.ensurePolled = function() {
        if (this.pollingFast && this.poll()) {
          this.pollingFast = false;
        }
      };

      TextareaInput.prototype.onKeyPress = function() {
        if (ie && ie_version >= 9) {
          this.hasSelection = null;
        }
        this.fastPoll();
      };

      TextareaInput.prototype.onContextMenu = function(e) {
        var input = this,
          cm = input.cm,
          display = cm.display,
          te = input.textarea;
        var pos = posFromMouse(cm, e),
          scrollPos = display.scroller.scrollTop;
        if (!pos || presto) {
          return
        } // Opera is difficult.

        // Reset the current text selection only if the click is done outside of the selection
        // and 'resetSelectionOnContextMenu' option is true.
        var reset = cm.options.resetSelectionOnContextMenu;
        if (reset && cm.doc.sel.contains(pos) == -1) {
          operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll);
        }

        var oldCSS = te.style.cssText,
          oldWrapperCSS = input.wrapper.style.cssText;
        input.wrapper.style.cssText = "position: absolute";
        var wrapperBox = input.wrapper.getBoundingClientRect();
        te.style.cssText = "position: absolute; width: 30px; height: 30px;\n      top: " + (e.clientY - wrapperBox.top - 5) + "px; left: " + (e.clientX - wrapperBox.left - 5) + "px;\n      z-index: 1000; background: " + (ie ? "rgba(255, 255, 255, .05)" : "transparent") + ";\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
        var oldScrollY;
        if (webkit) {
          oldScrollY = window.scrollY;
        } // Work around Chrome issue (#2712)
        display.input.focus();
        if (webkit) {
          window.scrollTo(null, oldScrollY);
        }
        display.input.reset();
        // Adds "Select all" to context menu in FF
        if (!cm.somethingSelected()) {
          te.value = input.prevInput = " ";
        }
        input.contextMenuPending = true;
        display.selForContextMenu = cm.doc.sel;
        clearTimeout(display.detectingSelectAll);

        // Select-all will be greyed out if there's nothing to select, so
        // this adds a zero-width space so that we can later check whether
        // it got selected.
        function prepareSelectAllHack() {
          if (te.selectionStart != null) {
            var selected = cm.somethingSelected();
            var extval = "\u200b" + (selected ? te.value : "");
            te.value = "\u21da"; // Used to catch context-menu undo
            te.value = extval;
            input.prevInput = selected ? "" : "\u200b";
            te.selectionStart = 1;
            te.selectionEnd = extval.length;
            // Re-set this, in case some other handler touched the
            // selection in the meantime.
            display.selForContextMenu = cm.doc.sel;
          }
        }

        function rehide() {
          input.contextMenuPending = false;
          input.wrapper.style.cssText = oldWrapperCSS;
          te.style.cssText = oldCSS;
          if (ie && ie_version < 9) {
            display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos);
          }

          // Try to detect the user choosing select-all
          if (te.selectionStart != null) {
            if (!ie || (ie && ie_version < 9)) {
              prepareSelectAllHack();
            }
            var i = 0,
              poll = function() {
                if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
                  te.selectionEnd > 0 && input.prevInput == "\u200b") {
                  operation(cm, selectAll)(cm);
                } else if (i++ < 10) {
                  display.detectingSelectAll = setTimeout(poll, 500);
                } else {
                  display.selForContextMenu = null;
                  display.input.reset();
                }
              };
            display.detectingSelectAll = setTimeout(poll, 200);
          }
        }

        if (ie && ie_version >= 9) {
          prepareSelectAllHack();
        }
        if (captureRightClick) {
          e_stop(e);
          var mouseup = function() {
            off(window, "mouseup", mouseup);
            setTimeout(rehide, 20);
          };
          on(window, "mouseup", mouseup);
        } else {
          setTimeout(rehide, 50);
        }
      };

      TextareaInput.prototype.readOnlyChanged = function(val) {
        if (!val) {
          this.reset();
        }
        this.textarea.disabled = val == "nocursor";
      };

      TextareaInput.prototype.setUneditable = function() {};

      TextareaInput.prototype.needsContentAttribute = false;

      function fromTextArea(textarea, options) {
        options = options ? copyObj(options) : {};
        options.value = textarea.value;
        if (!options.tabindex && textarea.tabIndex) {
          options.tabindex = textarea.tabIndex;
        }
        if (!options.placeholder && textarea.placeholder) {
          options.placeholder = textarea.placeholder;
        }
        // Set autofocus to true if this textarea is focused, or if it has
        // autofocus and no other element is focused.
        if (options.autofocus == null) {
          var hasFocus = activeElt();
          options.autofocus = hasFocus == textarea ||
            textarea.getAttribute("autofocus") != null && hasFocus == document.body;
        }

        function save() {
          textarea.value = cm.getValue();
        }

        var realSubmit;
        if (textarea.form) {
          on(textarea.form, "submit", save);
          // Deplorable hack to make the submit method do the right thing.
          if (!options.leaveSubmitMethodAlone) {
            var form = textarea.form;
            realSubmit = form.submit;
            try {
              var wrappedSubmit = form.submit = function() {
                save();
                form.submit = realSubmit;
                form.submit();
                form.submit = wrappedSubmit;
              };
            } catch (e) {}
          }
        }

        options.finishInit = function(cm) {
          cm.save = save;
          cm.getTextArea = function() {
            return textarea;
          };
          cm.toTextArea = function() {
            cm.toTextArea = isNaN; // Prevent this from being ran twice
            save();
            textarea.parentNode.removeChild(cm.getWrapperElement());
            textarea.style.display = "";
            if (textarea.form) {
              off(textarea.form, "submit", save);
              if (typeof textarea.form.submit == "function") {
                textarea.form.submit = realSubmit;
              }
            }
          };
        };

        textarea.style.display = "none";
        var cm = CodeMirror$1(function(node) {
            return textarea.parentNode.insertBefore(node, textarea.nextSibling);
          },
          options);
        return cm
      }

      function addLegacyProps(CodeMirror) {
        CodeMirror.off = off;
        CodeMirror.on = on;
        CodeMirror.wheelEventPixels = wheelEventPixels;
        CodeMirror.Doc = Doc;
        CodeMirror.splitLines = splitLinesAuto;
        CodeMirror.countColumn = countColumn;
        CodeMirror.findColumn = findColumn;
        CodeMirror.isWordChar = isWordCharBasic;
        CodeMirror.Pass = Pass;
        CodeMirror.signal = signal;
        CodeMirror.Line = Line;
        CodeMirror.changeEnd = changeEnd;
        CodeMirror.scrollbarModel = scrollbarModel;
        CodeMirror.Pos = Pos;
        CodeMirror.cmpPos = cmp;
        CodeMirror.modes = modes;
        CodeMirror.mimeModes = mimeModes;
        CodeMirror.resolveMode = resolveMode;
        CodeMirror.getMode = getMode;
        CodeMirror.modeExtensions = modeExtensions;
        CodeMirror.extendMode = extendMode;
        CodeMirror.copyState = copyState;
        CodeMirror.startState = startState;
        CodeMirror.innerMode = innerMode;
        CodeMirror.commands = commands;
        CodeMirror.keyMap = keyMap;
        CodeMirror.keyName = keyName;
        CodeMirror.isModifierKey = isModifierKey;
        CodeMirror.lookupKey = lookupKey;
        CodeMirror.normalizeKeyMap = normalizeKeyMap;
        CodeMirror.StringStream = StringStream;
        CodeMirror.SharedTextMarker = SharedTextMarker;
        CodeMirror.TextMarker = TextMarker;
        CodeMirror.LineWidget = LineWidget;
        CodeMirror.e_preventDefault = e_preventDefault;
        CodeMirror.e_stopPropagation = e_stopPropagation;
        CodeMirror.e_stop = e_stop;
        CodeMirror.addClass = addClass;
        CodeMirror.contains = contains;
        CodeMirror.rmClass = rmClass;
        CodeMirror.keyNames = keyNames;
      }

      // EDITOR CONSTRUCTOR

      defineOptions(CodeMirror$1);

      addEditorMethods(CodeMirror$1);

      // Set up methods on CodeMirror's prototype to redirect to the editor's document.
      var dontDelegate = "iter insert remove copy getEditor constructor".split(" ");
      for (var prop in Doc.prototype) {
        if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0) {
          CodeMirror$1.prototype[prop] = (function(method) {
            return function() {
              return method.apply(this.doc, arguments)
            }
          })(Doc.prototype[prop]);
        }
      }

      eventMixin(Doc);

      // INPUT HANDLING

      CodeMirror$1.inputStyles = {
        "textarea": TextareaInput,
        "contenteditable": ContentEditableInput
      };

      // MODE DEFINITION AND QUERYING

      // Extra arguments are stored as the mode's dependencies, which is
      // used by (legacy) mechanisms like loadmode.js to automatically
      // load a mode. (Preferred mechanism is the require/define calls.)
      CodeMirror$1.defineMode = function(name /*, mode, â€¦*/ ) {
        if (!CodeMirror$1.defaults.mode && name != "null") {
          CodeMirror$1.defaults.mode = name;
        }
        defineMode.apply(this, arguments);
      };

      CodeMirror$1.defineMIME = defineMIME;

      // Minimal default mode.
      CodeMirror$1.defineMode("null", function() {
        return ({
          token: function(stream) {
            return stream.skipToEnd();
          }
        });
      });
      CodeMirror$1.defineMIME("text/plain", "null");

      // EXTENSIONS

      CodeMirror$1.defineExtension = function(name, func) {
        CodeMirror$1.prototype[name] = func;
      };
      CodeMirror$1.defineDocExtension = function(name, func) {
        Doc.prototype[name] = func;
      };

      CodeMirror$1.fromTextArea = fromTextArea;

      addLegacyProps(CodeMirror$1);

      CodeMirror$1.version = "5.35.0";

      return CodeMirror$1;

    })));
  </script>
  <script type="text/javascript" once>
    // CodeMirror, copyright (c) by Marijn Haverbeke and others
    // Distributed under an MIT license: https://codemirror.net/LICENSE

    (function(mod) {
      if (typeof exports == "object" && typeof module == "object") // CommonJS
        mod(require("../../lib/codemirror"));
      else if (typeof define == "function" && define.amd) // AMD
        define(["../../lib/codemirror"], mod);
      else // Plain browser env
        mod(CodeMirror);
    })(function(CodeMirror) {
      "use strict";

      function wordRegexp(words) {
        return new RegExp("^((" + words.join(")|(") + "))\\b");
      }

      var wordOperators = wordRegexp(["and", "or", "not", "is"]);
      var commonKeywords = ["as", "assert", "break", "class", "continue",
        "def", "del", "elif", "else", "except", "finally",
        "for", "from", "global", "if", "import",
        "lambda", "pass", "raise", "return",
        "try", "while", "with", "yield", "in"
      ];
      var commonBuiltins = ["abs", "all", "any", "bin", "bool", "bytearray", "callable", "chr",
        "classmethod", "compile", "complex", "delattr", "dict", "dir", "divmod",
        "enumerate", "eval", "filter", "float", "format", "frozenset",
        "getattr", "globals", "hasattr", "hash", "help", "hex", "id",
        "input", "int", "isinstance", "issubclass", "iter", "len",
        "list", "locals", "map", "max", "memoryview", "min", "next",
        "object", "oct", "open", "ord", "pow", "property", "range",
        "repr", "reversed", "round", "set", "setattr", "slice",
        "sorted", "staticmethod", "str", "sum", "super", "tuple",
        "type", "vars", "zip", "__import__", "NotImplemented",
        "Ellipsis", "__debug__"
      ];
      CodeMirror.registerHelper("hintWords", "python", commonKeywords.concat(commonBuiltins));

      function top(state) {
        return state.scopes[state.scopes.length - 1];
      }

      CodeMirror.defineMode("python", function(conf, parserConf) {
        var ERRORCLASS = "error";

        var delimiters = parserConf.delimiters || parserConf.singleDelimiters || /^[\(\)\[\]\{\}@,:`=;\.\\]/;
        //               (Backwards-compatiblity with old, cumbersome config system)
        var operators = [parserConf.singleOperators, parserConf.doubleOperators, parserConf.doubleDelimiters, parserConf.tripleDelimiters,
          parserConf.operators || /^([-+*/%\/&|^]=?|[<>=]+|\/\/=?|\*\*=?|!=|[~!@])/
        ]
        for (var i = 0; i < operators.length; i++)
          if (!operators[i]) operators.splice(i--, 1)

        var hangingIndent = parserConf.hangingIndent || conf.indentUnit;

        var myKeywords = commonKeywords,
          myBuiltins = commonBuiltins;
        if (parserConf.extra_keywords != undefined)
          myKeywords = myKeywords.concat(parserConf.extra_keywords);

        if (parserConf.extra_builtins != undefined)
          myBuiltins = myBuiltins.concat(parserConf.extra_builtins);

        var py3 = !(parserConf.version && Number(parserConf.version) < 3)
        if (py3) {
          // since http://legacy.python.org/dev/peps/pep-0465/ @ is also an operator
          var identifiers = parserConf.identifiers || /^[_A-Za-z\u00A1-\uFFFF][_A-Za-z0-9\u00A1-\uFFFF]*/;
          myKeywords = myKeywords.concat(["nonlocal", "False", "True", "None", "async", "await"]);
          myBuiltins = myBuiltins.concat(["ascii", "bytes", "exec", "print"]);
          var stringPrefixes = new RegExp("^(([rbuf]|(br)|(fr))?('{3}|\"{3}|['\"]))", "i");
        } else {
          var identifiers = parserConf.identifiers || /^[_A-Za-z][_A-Za-z0-9]*/;
          myKeywords = myKeywords.concat(["exec", "print"]);
          myBuiltins = myBuiltins.concat(["apply", "basestring", "buffer", "cmp", "coerce", "execfile",
            "file", "intern", "long", "raw_input", "reduce", "reload",
            "unichr", "unicode", "xrange", "False", "True", "None"
          ]);
          var stringPrefixes = new RegExp("^(([rubf]|(ur)|(br))?('{3}|\"{3}|['\"]))", "i");
        }
        var keywords = wordRegexp(myKeywords);
        var builtins = wordRegexp(myBuiltins);

        // tokenizers
        function tokenBase(stream, state) {
          var sol = stream.sol() && state.lastToken != "\\"
          if (sol) state.indent = stream.indentation()
          // Handle scope changes
          if (sol && top(state).type == "py") {
            var scopeOffset = top(state).offset;
            if (stream.eatSpace()) {
              var lineOffset = stream.indentation();
              if (lineOffset > scopeOffset)
                pushPyScope(state);
              else if (lineOffset < scopeOffset && dedent(stream, state) && stream.peek() != "#")
                state.errorToken = true;
              return null;
            } else {
              var style = tokenBaseInner(stream, state);
              if (scopeOffset > 0 && dedent(stream, state))
                style += " " + ERRORCLASS;
              return style;
            }
          }
          return tokenBaseInner(stream, state);
        }

        function tokenBaseInner(stream, state) {
          if (stream.eatSpace()) return null;

          // Handle Comments
          if (stream.match(/^#.*/)) return "comment";

          // Handle Number Literals
          if (stream.match(/^[0-9\.]/, false)) {
            var floatLiteral = false;
            // Floats
            if (stream.match(/^[\d_]*\.\d+(e[\+\-]?\d+)?/i)) {
              floatLiteral = true;
            }
            if (stream.match(/^[\d_]+\.\d*/)) {
              floatLiteral = true;
            }
            if (stream.match(/^\.\d+/)) {
              floatLiteral = true;
            }
            if (floatLiteral) {
              // Float literals may be "imaginary"
              stream.eat(/J/i);
              return "number";
            }
            // Integers
            var intLiteral = false;
            // Hex
            if (stream.match(/^0x[0-9a-f_]+/i)) intLiteral = true;
            // Binary
            if (stream.match(/^0b[01_]+/i)) intLiteral = true;
            // Octal
            if (stream.match(/^0o[0-7_]+/i)) intLiteral = true;
            // Decimal
            if (stream.match(/^[1-9][\d_]*(e[\+\-]?[\d_]+)?/)) {
              // Decimal literals may be "imaginary"
              stream.eat(/J/i);
              // TODO - Can you have imaginary longs?
              intLiteral = true;
            }
            // Zero by itself with no other piece of number.
            if (stream.match(/^0(?![\dx])/i)) intLiteral = true;
            if (intLiteral) {
              // Integer literals may be "long"
              stream.eat(/L/i);
              return "number";
            }
          }

          // Handle Strings
          if (stream.match(stringPrefixes)) {
            var isFmtString = stream.current().toLowerCase().indexOf('f') !== -1;
            if (!isFmtString) {
              state.tokenize = tokenStringFactory(stream.current(), state.tokenize);
              return state.tokenize(stream, state);
            } else {
              state.tokenize = formatStringFactory(stream.current(), state.tokenize);
              return state.tokenize(stream, state);
            }
          }

          for (var i = 0; i < operators.length; i++)
            if (stream.match(operators[i])) return "operator"

          if (stream.match(delimiters)) return "punctuation";

          if (state.lastToken == "." && stream.match(identifiers))
            return "property";

          if (stream.match(keywords) || stream.match(wordOperators))
            return "keyword";

          if (stream.match(builtins))
            return "builtin";

          if (stream.match(/^(self|cls)\b/))
            return "variable-2";

          if (stream.match(identifiers)) {
            if (state.lastToken == "def" || state.lastToken == "class")
              return "def";
            return "variable";
          }

          // Handle non-detected items
          stream.next();
          return ERRORCLASS;
        }

        function formatStringFactory(delimiter, tokenOuter) {
          while ("rubf".indexOf(delimiter.charAt(0).toLowerCase()) >= 0)
            delimiter = delimiter.substr(1);

          var singleline = delimiter.length == 1;
          var OUTCLASS = "string";

          function tokenNestedExpr(depth) {
            return function(stream, state) {
              var inner = tokenBaseInner(stream, state)
              if (inner == "punctuation") {
                if (stream.current() == "{") {
                  state.tokenize = tokenNestedExpr(depth + 1)
                } else if (stream.current() == "}") {
                  if (depth > 1) state.tokenize = tokenNestedExpr(depth - 1)
                  else state.tokenize = tokenString
                }
              }
              return inner
            }
          }

          function tokenString(stream, state) {
            while (!stream.eol()) {
              stream.eatWhile(/[^'"\{\}\\]/);
              if (stream.eat("\\")) {
                stream.next();
                if (singleline && stream.eol())
                  return OUTCLASS;
              } else if (stream.match(delimiter)) {
                state.tokenize = tokenOuter;
                return OUTCLASS;
              } else if (stream.match('{{')) {
                // ignore {{ in f-str
                return OUTCLASS;
              } else if (stream.match('{', false)) {
                // switch to nested mode
                state.tokenize = tokenNestedExpr(0)
                if (stream.current()) return OUTCLASS;
                else return state.tokenize(stream, state)
              } else if (stream.match('}}')) {
                return OUTCLASS;
              } else if (stream.match('}')) {
                // single } in f-string is an error
                return ERRORCLASS;
              } else {
                stream.eat(/['"]/);
              }
            }
            if (singleline) {
              if (parserConf.singleLineStringErrors)
                return ERRORCLASS;
              else
                state.tokenize = tokenOuter;
            }
            return OUTCLASS;
          }
          tokenString.isString = true;
          return tokenString;
        }

        function tokenStringFactory(delimiter, tokenOuter) {
          while ("rubf".indexOf(delimiter.charAt(0).toLowerCase()) >= 0)
            delimiter = delimiter.substr(1);

          var singleline = delimiter.length == 1;
          var OUTCLASS = "string";

          function tokenString(stream, state) {
            while (!stream.eol()) {
              stream.eatWhile(/[^'"\\]/);
              if (stream.eat("\\")) {
                stream.next();
                if (singleline && stream.eol())
                  return OUTCLASS;
              } else if (stream.match(delimiter)) {
                state.tokenize = tokenOuter;
                return OUTCLASS;
              } else {
                stream.eat(/['"]/);
              }
            }
            if (singleline) {
              if (parserConf.singleLineStringErrors)
                return ERRORCLASS;
              else
                state.tokenize = tokenOuter;
            }
            return OUTCLASS;
          }
          tokenString.isString = true;
          return tokenString;
        }

        function pushPyScope(state) {
          while (top(state).type != "py") state.scopes.pop()
          state.scopes.push({
            offset: top(state).offset + conf.indentUnit,
            type: "py",
            align: null
          })
        }

        function pushBracketScope(stream, state, type) {
          var align = stream.match(/^([\s\[\{\(]|#.*)*$/, false) ? null : stream.column() + 1
          state.scopes.push({
            offset: state.indent + hangingIndent,
            type: type,
            align: align
          })
        }

        function dedent(stream, state) {
          var indented = stream.indentation();
          while (state.scopes.length > 1 && top(state).offset > indented) {
            if (top(state).type != "py") return true;
            state.scopes.pop();
          }
          return top(state).offset != indented;
        }

        function tokenLexer(stream, state) {
          if (stream.sol()) state.beginningOfLine = true;

          var style = state.tokenize(stream, state);
          var current = stream.current();

          // Handle decorators
          if (state.beginningOfLine && current == "@")
            return stream.match(identifiers, false) ? "meta" : py3 ? "operator" : ERRORCLASS;

          if (/\S/.test(current)) state.beginningOfLine = false;

          if ((style == "variable" || style == "builtin") &&
            state.lastToken == "meta")
            style = "meta";

          // Handle scope changes.
          if (current == "pass" || current == "return")
            state.dedent += 1;

          if (current == "lambda") state.lambda = true;
          if (current == ":" && !state.lambda && top(state).type == "py")
            pushPyScope(state);

          if (current.length == 1 && !/string|comment/.test(style)) {
            var delimiter_index = "[({".indexOf(current);
            if (delimiter_index != -1)
              pushBracketScope(stream, state, "])}".slice(delimiter_index, delimiter_index + 1));

            delimiter_index = "])}".indexOf(current);
            if (delimiter_index != -1) {
              if (top(state).type == current) state.indent = state.scopes.pop().offset - hangingIndent
              else return ERRORCLASS;
            }
          }
          if (state.dedent > 0 && stream.eol() && top(state).type == "py") {
            if (state.scopes.length > 1) state.scopes.pop();
            state.dedent -= 1;
          }

          return style;
        }

        var external = {
          startState: function(basecolumn) {
            return {
              tokenize: tokenBase,
              scopes: [{
                offset: basecolumn || 0,
                type: "py",
                align: null
              }],
              indent: basecolumn || 0,
              lastToken: null,
              lambda: false,
              dedent: 0
            };
          },

          token: function(stream, state) {
            var addErr = state.errorToken;
            if (addErr) state.errorToken = false;
            var style = tokenLexer(stream, state);

            if (style && style != "comment")
              state.lastToken = (style == "keyword" || style == "punctuation") ? stream.current() : style;
            if (style == "punctuation") style = null;

            if (stream.eol() && state.lambda)
              state.lambda = false;
            return addErr ? style + " " + ERRORCLASS : style;
          },

          indent: function(state, textAfter) {
            if (state.tokenize != tokenBase)
              return state.tokenize.isString ? CodeMirror.Pass : 0;

            var scope = top(state),
              closing = scope.type == textAfter.charAt(0)
            if (scope.align != null)
              return scope.align - (closing ? 1 : 0)
            else
              return scope.offset - (closing ? hangingIndent : 0)
          },

          electricInput: /^\s*[\}\]\)]$/,
          closeBrackets: {
            triples: "'\""
          },
          lineComment: "#",
          fold: "indent"
        };
        return external;
      });

      CodeMirror.defineMIME("text/x-python", "python");

      var words = function(str) {
        return str.split(" ");
      };

      CodeMirror.defineMIME("text/x-cython", {
        name: "python",
        extra_keywords: words("by cdef cimport cpdef ctypedef enum except " +
          "extern gil include nogil property public " +
          "readonly struct union DEF IF ELIF ELSE")
      });

    });
  </script>
  <style type="text/css" once>
    .CodeMirror {
      font-family: monospace;
      height: 300px;
      color: black;
      direction: ltr
    }

    .CodeMirror-lines {
      padding: 4px 0
    }

    .CodeMirror pre {
      padding: 0 4px
    }

    .CodeMirror-scrollbar-filler,
    .CodeMirror-gutter-filler {
      background-color: white
    }

    .CodeMirror-gutters {
      border-right: 1px solid #ddd;
      background-color: #f7f7f7;
      white-space: nowrap
    }

    .CodeMirror-linenumber {
      padding: 0 3px 0 5px;
      min-width: 20px;
      text-align: right;
      color: #999;
      white-space: nowrap
    }

    .CodeMirror-guttermarker {
      color: black
    }

    .CodeMirror-guttermarker-subtle {
      color: #999
    }

    .CodeMirror-cursor {
      border-left: 1px solid black;
      border-right: none;
      width: 0
    }

    .CodeMirror div.CodeMirror-secondarycursor {
      border-left: 1px solid silver
    }

    .cm-fat-cursor .CodeMirror-cursor {
      width: auto;
      border: 0 !important;
      background: #7e7
    }

    .cm-fat-cursor div.CodeMirror-cursors {
      z-index: 1
    }

    .cm-fat-cursor-mark {
      background-color: rgba(20, 255, 20, 0.5);
      -webkit-animation: blink 1.06s steps(1) infinite;
      -moz-animation: blink 1.06s steps(1) infinite;
      animation: blink 1.06s steps(1) infinite
    }

    .cm-animate-fat-cursor {
      width: auto;
      border: 0;
      -webkit-animation: blink 1.06s steps(1) infinite;
      -moz-animation: blink 1.06s steps(1) infinite;
      animation: blink 1.06s steps(1) infinite;
      background-color: #7e7
    }

    @-moz-keyframes blink {
      0% {}

      50% {
        background-color: transparent
      }

      100% {}
    }

    @-webkit-keyframes blink {
      0% {}

      50% {
        background-color: transparent
      }

      100% {}
    }

    @keyframes blink {
      0% {}

      50% {
        background-color: transparent
      }

      100% {}
    }

    .cm-tab {
      display: inline-block;
      text-decoration: inherit
    }

    .CodeMirror-rulers {
      position: absolute;
      left: 0;
      right: 0;
      top: -50px;
      bottom: -20px;
      overflow: hidden
    }

    .CodeMirror-ruler {
      border-left: 1px solid #ccc;
      top: 0;
      bottom: 0;
      position: absolute
    }

    .cm-s-default .cm-header {
      color: blue
    }

    .cm-s-default .cm-quote {
      color: #090
    }

    .cm-negative {
      color: #d44
    }

    .cm-positive {
      color: #292
    }

    .cm-header,
    .cm-strong {
      font-weight: bold
    }

    .cm-em {
      font-style: italic
    }

    .cm-link {
      text-decoration: underline
    }

    .cm-strikethrough {
      text-decoration: line-through
    }

    .cm-s-default .cm-keyword {
      color: #708
    }

    .cm-s-default .cm-atom {
      color: #219
    }

    .cm-s-default .cm-number {
      color: #164
    }

    .cm-s-default .cm-def {
      color: #00f
    }

    .cm-s-default .cm-variable-2 {
      color: #05a
    }

    .cm-s-default .cm-variable-3,
    .cm-s-default .cm-type {
      color: #085
    }

    .cm-s-default .cm-comment {
      color: #a50
    }

    .cm-s-default .cm-string {
      color: #a11
    }

    .cm-s-default .cm-string-2 {
      color: #f50
    }

    .cm-s-default .cm-meta {
      color: #555
    }

    .cm-s-default .cm-qualifier {
      color: #555
    }

    .cm-s-default .cm-builtin {
      color: #30a
    }

    .cm-s-default .cm-bracket {
      color: #997
    }

    .cm-s-default .cm-tag {
      color: #170
    }

    .cm-s-default .cm-attribute {
      color: #00c
    }

    .cm-s-default .cm-hr {
      color: #999
    }

    .cm-s-default .cm-link {
      color: #00c
    }

    .cm-s-default .cm-error {
      color: #f00
    }

    .cm-invalidchar {
      color: #f00
    }

    .CodeMirror-composing {
      border-bottom: 2px solid
    }

    div.CodeMirror span.CodeMirror-matchingbracket {
      color: #0b0
    }

    div.CodeMirror span.CodeMirror-nonmatchingbracket {
      color: #a22
    }

    .CodeMirror-matchingtag {
      background: rgba(255, 150, 0, 0.3)
    }

    .CodeMirror-activeline-background {
      background: #e8f2ff
    }

    .CodeMirror {
      position: relative;
      overflow: hidden;
      background: white
    }

    .CodeMirror-scroll {
      overflow: scroll !important;
      margin-bottom: -30px;
      margin-right: -30px;
      padding-bottom: 30px;
      height: 100%;
      outline: none;
      position: relative
    }

    .CodeMirror-sizer {
      position: relative;
      border-right: 30px solid transparent
    }

    .CodeMirror-vscrollbar,
    .CodeMirror-hscrollbar,
    .CodeMirror-scrollbar-filler,
    .CodeMirror-gutter-filler {
      position: absolute;
      z-index: 6;
      display: none
    }

    .CodeMirror-vscrollbar {
      right: 0;
      top: 0;
      overflow-x: hidden;
      overflow-y: scroll
    }

    .CodeMirror-hscrollbar {
      bottom: 0;
      left: 0;
      overflow-y: hidden;
      overflow-x: scroll
    }

    .CodeMirror-scrollbar-filler {
      right: 0;
      bottom: 0
    }

    .CodeMirror-gutter-filler {
      left: 0;
      bottom: 0
    }

    .CodeMirror-gutters {
      position: absolute;
      left: 0;
      top: 0;
      min-height: 100%;
      z-index: 3
    }

    .CodeMirror-gutter {
      white-space: normal;
      height: 100%;
      display: inline-block;
      vertical-align: top;
      margin-bottom: -30px
    }

    .CodeMirror-gutter-wrapper {
      position: absolute;
      z-index: 4;
      background: none !important;
      border: none !important
    }

    .CodeMirror-gutter-background {
      position: absolute;
      top: 0;
      bottom: 0;
      z-index: 4
    }

    .CodeMirror-gutter-elt {
      position: absolute;
      cursor: default;
      z-index: 4
    }

    .CodeMirror-gutter-wrapper ::selection {
      background-color: transparent
    }

    .CodeMirror-gutter-wrapper ::-moz-selection {
      background-color: transparent
    }

    .CodeMirror-lines {
      cursor: text;
      min-height: 1px
    }

    .CodeMirror pre {
      -moz-border-radius: 0;
      -webkit-border-radius: 0;
      border-radius: 0;
      border-width: 0;
      background: transparent;
      font-family: inherit;
      font-size: inherit;
      margin: 0;
      white-space: pre;
      word-wrap: normal;
      line-height: inherit;
      color: inherit;
      z-index: 2;
      position: relative;
      overflow: visible;
      -webkit-tap-highlight-color: transparent;
      -webkit-font-variant-ligatures: contextual;
      font-variant-ligatures: contextual
    }

    .CodeMirror-wrap pre {
      word-wrap: break-word;
      white-space: pre-wrap;
      word-break: normal
    }

    .CodeMirror-linebackground {
      position: absolute;
      left: 0;
      right: 0;
      top: 0;
      bottom: 0;
      z-index: 0
    }

    .CodeMirror-linewidget {
      position: relative;
      z-index: 2;
      padding: 0.1px
    }

    .CodeMirror-rtl pre {
      direction: rtl
    }

    .CodeMirror-code {
      outline: none
    }

    .CodeMirror-scroll,
    .CodeMirror-sizer,
    .CodeMirror-gutter,
    .CodeMirror-gutters,
    .CodeMirror-linenumber {
      -moz-box-sizing: content-box;
      box-sizing: content-box
    }

    .CodeMirror-measure {
      position: absolute;
      width: 100%;
      height: 0;
      overflow: hidden;
      visibility: hidden
    }

    .CodeMirror-cursor {
      position: absolute;
      pointer-events: none
    }

    .CodeMirror-measure pre {
      position: static
    }

    div.CodeMirror-cursors {
      visibility: hidden;
      position: relative;
      z-index: 3
    }

    div.CodeMirror-dragcursors {
      visibility: visible
    }

    .CodeMirror-focused div.CodeMirror-cursors {
      visibility: visible
    }

    .CodeMirror-selected {
      background: #d9d9d9
    }

    .CodeMirror-focused .CodeMirror-selected {
      background: #d7d4f0
    }

    .CodeMirror-crosshair {
      cursor: crosshair
    }

    .CodeMirror-line::selection,
    .CodeMirror-line>span::selection,
    .CodeMirror-line>span>span::selection {
      background: #d7d4f0
    }

    .CodeMirror-line::-moz-selection,
    .CodeMirror-line>span::-moz-selection,
    .CodeMirror-line>span>span::-moz-selection {
      background: #d7d4f0
    }

    .cm-searching {
      background-color: #ffa;
      background-color: rgba(255, 255, 0, 0.4)
    }

    .cm-force-border {
      padding-right: .1px
    }

    @media print {
      .CodeMirror div.CodeMirror-cursors {
        visibility: hidden
      }
    }

    .cm-tab-wrap-hack:after {
      content: ''
    }

    span.CodeMirror-selectedtext {
      background: none
    }
  </style>
  <textarea id='demotext' class="code-pad">$ npm run build

<h2>Test</h2>
<div class=" pds-blogs-post-param pds-blogs-post-param-code">
  <script type="text/javascript" once>
    // CodeMirror, copyright (c) by Marijn Haverbeke and others
    // Distributed under an MIT license: http://codemirror.net/LICENSE

    // This is CodeMirror (http://codemirror.net), a code editor
    // implemented in JavaScript on top of the browser's DOM.
    //
    // You can find some technical background for some of the code below
    // at http://marijnhaverbeke.nl/blog/#cm-internals .

    (function(global, factory) {
      typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
        typeof define === 'function' && define.amd ? define(factory) :
        (global.CodeMirror = factory());
    }(this, (function() {
      'use strict';

      // Kludges for bugs and behavior differences that can't be feature
      // detected are enabled based on userAgent etc sniffing.
      var userAgent = navigator.userAgent;
      var platform = navigator.platform;

      var gecko = /gecko\/\d/i.test(userAgent);
      var ie_upto10 = /MSIE \d/.test(userAgent);
      var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent);
      var edge = /Edge\/(\d+)/.exec(userAgent);
      var ie = ie_upto10 || ie_11up || edge;
      var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1]);
      var webkit = !edge && /WebKit\//.test(userAgent);
      var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent);
      var chrome = !edge && /Chrome\//.test(userAgent);
      var presto = /Opera\//.test(userAgent);
      var safari = /Apple Computer/.test(navigator.vendor);
      var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent);
      var phantom = /PhantomJS/.test(userAgent);

      var ios = !edge && /AppleWebKit/.test(userAgent) && /Mobile\/\w+/.test(userAgent);
      var android = /Android/.test(userAgent);
      // This is woefully incomplete. Suggestions for alternative methods welcome.
      var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);
      var mac = ios || /Mac/.test(platform);
      var chromeOS = /\bCrOS\b/.test(userAgent);
      var windows = /win/i.test(platform);

      var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/);
      if (presto_version) {
        presto_version = Number(presto_version[1]);
      }
      if (presto_version && presto_version >= 15) {
        presto = false;
        webkit = true;
      }
      // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
      var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
      var captureRightClick = gecko || (ie && ie_version >= 9);

      function classTest(cls) {
        return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*")
      }

      var rmClass = function(node, cls) {
        var current = node.className;
        var match = classTest(cls).exec(current);
        if (match) {
          var after = current.slice(match.index + match[0].length);
          node.className = current.slice(0, match.index) + (after ? match[1] + after : "");
        }
      };

      function removeChildren(e) {
        for (var count = e.childNodes.length; count > 0; --count) {
          e.removeChild(e.firstChild);
        }
        return e
      }

      function removeChildrenAndAdd(parent, e) {
        return removeChildren(parent).appendChild(e)
      }

      function elt(tag, content, className, style) {
        var e = document.createElement(tag);
        if (className) {
          e.className = className;
        }
        if (style) {
          e.style.cssText = style;
        }
        if (typeof content == "string") {
          e.appendChild(document.createTextNode(content));
        } else if (content) {
          for (var i = 0; i < content.length; ++i) {
            e.appendChild(content[i]);
          }
        }
        return e
      }
      // wrapper for elt, which removes the elt from the accessibility tree
      function eltP(tag, content, className, style) {
        var e = elt(tag, content, className, style);
        e.setAttribute("role", "presentation");
        return e
      }

      var range;
      if (document.createRange) {
        range = function(node, start, end, endNode) {
          var r = document.createRange();
          r.setEnd(endNode || node, end);
          r.setStart(node, start);
          return r
        };
      } else {
        range = function(node, start, end) {
          var r = document.body.createTextRange();
          try {
            r.moveToElementText(node.parentNode);
          } catch (e) {
            return r
          }
          r.collapse(true);
          r.moveEnd("character", end);
          r.moveStart("character", start);
          return r
        };
      }

      function contains(parent, child) {
        if (child.nodeType == 3) // Android browser always returns false when child is a textnode
        {
          child = child.parentNode;
        }
        if (parent.contains) {
          return parent.contains(child)
        }
        do {
          if (child.nodeType == 11) {
            child = child.host;
          }
          if (child == parent) {
            return true
          }
        } while (child = child.parentNode)
      }

      function activeElt() {
        // IE and Edge may throw an "Unspecified Error" when accessing document.activeElement.
        // IE < 10 will throw when accessed while the page is loading or in an iframe.
        // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.
        var activeElement;
        try {
          activeElement = document.activeElement;
        } catch (e) {
          activeElement = document.body || null;
        }
        while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement) {
          activeElement = activeElement.shadowRoot.activeElement;
        }
        return activeElement
      }

      function addClass(node, cls) {
        var current = node.className;
        if (!classTest(cls).test(current)) {
          node.className += (current ? " " : "") + cls;
        }
      }

      function joinClasses(a, b) {
        var as = a.split(" ");
        for (var i = 0; i < as.length; i++) {
          if (as[i] && !classTest(as[i]).test(b)) {
            b += " " + as[i];
          }
        }
        return b
      }

      var selectInput = function(node) {
        node.select();
      };
      if (ios) // Mobile Safari apparently has a bug where select() is broken.
      {
        selectInput = function(node) {
          node.selectionStart = 0;
          node.selectionEnd = node.value.length;
        };
      } else if (ie) // Suppress mysterious IE10 errors
      {
        selectInput = function(node) {
          try {
            node.select();
          } catch (_e) {}
        };
      }

      function bind(f) {
        var args = Array.prototype.slice.call(arguments, 1);
        return function() {
          return f.apply(null, args)
        }
      }

      function copyObj(obj, target, overwrite) {
        if (!target) {
          target = {};
        }
        for (var prop in obj) {
          if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop))) {
            target[prop] = obj[prop];
          }
        }
        return target
      }

      // Counts the column offset in a string, taking tabs into account.
      // Used mostly to find indentation.
      function countColumn(string, end, tabSize, startIndex, startValue) {
        if (end == null) {
          end = string.search(/[^\s\u00a0]/);
          if (end == -1) {
            end = string.length;
          }
        }
        for (var i = startIndex || 0, n = startValue || 0;;) {
          var nextTab = string.indexOf("\t", i);
          if (nextTab < 0 || nextTab >= end) {
            return n + (end - i)
          }
          n += nextTab - i;
          n += tabSize - (n % tabSize);
          i = nextTab + 1;
        }
      }

      var Delayed = function() {
        this.id = null;
      };
      Delayed.prototype.set = function(ms, f) {
        clearTimeout(this.id);
        this.id = setTimeout(f, ms);
      };

      function indexOf(array, elt) {
        for (var i = 0; i < array.length; ++i) {
          if (array[i] == elt) {
            return i
          }
        }
        return -1
      }

      // Number of pixels added to scroller and sizer to hide scrollbar
      var scrollerGap = 30;

      // Returned or thrown by various protocols to signal 'I'm not
      // handling this'.
      var Pass = {
        toString: function() {
          return "CodeMirror.Pass"
        }
      };

      // Reused option objects for setSelection & friends
      var sel_dontScroll = {
        scroll: false
      };
      var sel_mouse = {
        origin: "*mouse"
      };
      var sel_move = {
        origin: "+move"
      };

      // The inverse of countColumn -- find the offset that corresponds to
      // a particular column.
      function findColumn(string, goal, tabSize) {
        for (var pos = 0, col = 0;;) {
          var nextTab = string.indexOf("\t", pos);
          if (nextTab == -1) {
            nextTab = string.length;
          }
          var skipped = nextTab - pos;
          if (nextTab == string.length || col + skipped >= goal) {
            return pos + Math.min(skipped, goal - col)
          }
          col += nextTab - pos;
          col += tabSize - (col % tabSize);
          pos = nextTab + 1;
          if (col >= goal) {
            return pos
          }
        }
      }

      var spaceStrs = [""];

      function spaceStr(n) {
        while (spaceStrs.length <= n) {
          spaceStrs.push(lst(spaceStrs) + " ");
        }
        return spaceStrs[n]
      }

      function lst(arr) {
        return arr[arr.length - 1]
      }

      function map(array, f) {
        var out = [];
        for (var i = 0; i < array.length; i++) {
          out[i] = f(array[i], i);
        }
        return out
      }

      function insertSorted(array, value, score) {
        var pos = 0,
          priority = score(value);
        while (pos < array.length && score(array[pos]) <= priority) {
          pos++;
        }
        array.splice(pos, 0, value);
      }

      function nothing() {}

      function createObj(base, props) {
        var inst;
        if (Object.create) {
          inst = Object.create(base);
        } else {
          nothing.prototype = base;
          inst = new nothing();
        }
        if (props) {
          copyObj(props, inst);
        }
        return inst
      }

      var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;

      function isWordCharBasic(ch) {
        return /\w/.test(ch) || ch > "\x80" &&
          (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))
      }

      function isWordChar(ch, helper) {
        if (!helper) {
          return isWordCharBasic(ch)
        }
        if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) {
          return true
        }
        return helper.test(ch)
      }

      function isEmpty(obj) {
        for (var n in obj) {
          if (obj.hasOwnProperty(n) && obj[n]) {
            return false
          }
        }
        return true
      }

      // Extending unicode characters. A series of a non-extending char +
      // any number of extending chars is treated as a single unit as far
      // as editing and measuring is concerned. This is not fully correct,
      // since some scripts/fonts/browsers also treat other configurations
      // of code points as a group.
      var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;

      function isExtendingChar(ch) {
        return ch.charCodeAt(0) >= 768 && extendingChars.test(ch)
      }

      // Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.
      function skipExtendingChars(str, pos, dir) {
        while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) {
          pos += dir;
        }
        return pos
      }

      // Returns the value from the range [`from`; `to`] that satisfies
      // `pred` and is closest to `from`. Assumes that at least `to`
      // satisfies `pred`. Supports `from` being greater than `to`.
      function findFirst(pred, from, to) {
        // At any point we are certain `to` satisfies `pred`, don't know
        // whether `from` does.
        var dir = from > to ? -1 : 1;
        for (;;) {
          if (from == to) {
            return from
          }
          var midF = (from + to) / 2,
            mid = dir < 0 ? Math.ceil(midF) : Math.floor(midF);
          if (mid == from) {
            return pred(mid) ? from : to
          }
          if (pred(mid)) {
            to = mid;
          } else {
            from = mid + dir;
          }
        }
      }

      // The display handles the DOM integration, both for input reading
      // and content drawing. It holds references to DOM nodes and
      // display-related state.

      function Display(place, doc, input) {
        var d = this;
        this.input = input;

        // Covers bottom-right square when both scrollbars are present.
        d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
        d.scrollbarFiller.setAttribute("cm-not-content", "true");
        // Covers bottom of gutter when coverGutterNextToScrollbar is on
        // and h scrollbar is present.
        d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
        d.gutterFiller.setAttribute("cm-not-content", "true");
        // Will contain the actual code, positioned to cover the viewport.
        d.lineDiv = eltP("div", null, "CodeMirror-code");
        // Elements are added to these to represent selection and cursors.
        d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
        d.cursorDiv = elt("div", null, "CodeMirror-cursors");
        // A visibility: hidden element used to find the size of things.
        d.measure = elt("div", null, "CodeMirror-measure");
        // When lines outside of the viewport are measured, they are drawn in this.
        d.lineMeasure = elt("div", null, "CodeMirror-measure");
        // Wraps everything that needs to exist inside the vertically-padded coordinate system
        d.lineSpace = eltP("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
          null, "position: relative; outline: none");
        var lines = eltP("div", [d.lineSpace], "CodeMirror-lines");
        // Moved around its parent to cover visible view.
        d.mover = elt("div", [lines], null, "position: relative");
        // Set to the height of the document, allowing scrolling.
        d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
        d.sizerWidth = null;
        // Behavior of elts with overflow: auto and padding is
        // inconsistent across browsers. This is used to ensure the
        // scrollable area is big enough.
        d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;");
        // Will contain the gutters, if any.
        d.gutters = elt("div", null, "CodeMirror-gutters");
        d.lineGutter = null;
        // Actual scrollable element.
        d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
        d.scroller.setAttribute("tabIndex", "-1");
        // The element in which the editor lives.
        d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");

        // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
        if (ie && ie_version < 8) {
          d.gutters.style.zIndex = -1;
          d.scroller.style.paddingRight = 0;
        }
        if (!webkit && !(gecko && mobile)) {
          d.scroller.draggable = true;
        }

        if (place) {
          if (place.appendChild) {
            place.appendChild(d.wrapper);
          } else {
            place(d.wrapper);
          }
        }

        // Current rendered range (may be bigger than the view window).
        d.viewFrom = d.viewTo = doc.first;
        d.reportedViewFrom = d.reportedViewTo = doc.first;
        // Information about the rendered lines.
        d.view = [];
        d.renderedView = null;
        // Holds info about a single rendered line when it was rendered
        // for measurement, while not in view.
        d.externalMeasured = null;
        // Empty space (in pixels) above the view
        d.viewOffset = 0;
        d.lastWrapHeight = d.lastWrapWidth = 0;
        d.updateLineNumbers = null;

        d.nativeBarWidth = d.barHeight = d.barWidth = 0;
        d.scrollbarsClipped = false;

        // Used to only resize the line number gutter when necessary (when
        // the amount of lines crosses a boundary that makes its width change)
        d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
        // Set to true when a non-horizontal-scrolling line widget is
        // added. As an optimization, line widget aligning is skipped when
        // this is false.
        d.alignWidgets = false;

        d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;

        // Tracks the maximum line length so that the horizontal scrollbar
        // can be kept static when scrolling.
        d.maxLine = null;
        d.maxLineLength = 0;
        d.maxLineChanged = false;

        // Used for measuring wheel scrolling granularity
        d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;

        // True when shift is held down.
        d.shift = false;

        // Used to track whether anything happened since the context menu
        // was opened.
        d.selForContextMenu = null;

        d.activeTouch = null;

        input.init(d);
      }

      // Find the line object corresponding to the given line number.
      function getLine(doc, n) {
        n -= doc.first;
        if (n < 0 || n >= doc.size) {
          throw new Error("There is no line " + (n + doc.first) + " in the document.")
        }
        var chunk = doc;
        while (!chunk.lines) {
          for (var i = 0;; ++i) {
            var child = chunk.children[i],
              sz = child.chunkSize();
            if (n < sz) {
              chunk = child;
              break
            }
            n -= sz;
          }
        }
        return chunk.lines[n]
      }

      // Get the part of a document between two positions, as an array of
      // strings.
      function getBetween(doc, start, end) {
        var out = [],
          n = start.line;
        doc.iter(start.line, end.line + 1, function(line) {
          var text = line.text;
          if (n == end.line) {
            text = text.slice(0, end.ch);
          }
          if (n == start.line) {
            text = text.slice(start.ch);
          }
          out.push(text);
          ++n;
        });
        return out
      }
      // Get the lines between from and to, as array of strings.
      function getLines(doc, from, to) {
        var out = [];
        doc.iter(from, to, function(line) {
          out.push(line.text);
        }); // iter aborts when callback returns truthy value
        return out
      }

      // Update the height of a line, propagating the height change
      // upwards to parent nodes.
      function updateLineHeight(line, height) {
        var diff = height - line.height;
        if (diff) {
          for (var n = line; n; n = n.parent) {
            n.height += diff;
          }
        }
      }

      // Given a line object, find its line number by walking up through
      // its parent links.
      function lineNo(line) {
        if (line.parent == null) {
          return null
        }
        var cur = line.parent,
          no = indexOf(cur.lines, line);
        for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
          for (var i = 0;; ++i) {
            if (chunk.children[i] == cur) {
              break
            }
            no += chunk.children[i].chunkSize();
          }
        }
        return no + cur.first
      }

      // Find the line at the given vertical position, using the height
      // information in the document tree.
      function lineAtHeight(chunk, h) {
        var n = chunk.first;
        outer: do {
          for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {
            var child = chunk.children[i$1],
              ch = child.height;
            if (h < ch) {
              chunk = child;
              continue outer
            }
            h -= ch;
            n += child.chunkSize();
          }
          return n
        } while (!chunk.lines)
        var i = 0;
        for (; i < chunk.lines.length; ++i) {
          var line = chunk.lines[i],
            lh = line.height;
          if (h < lh) {
            break
          }
          h -= lh;
        }
        return n + i
      }

      function isLine(doc, l) {
        return l >= doc.first && l < doc.first + doc.size
      }

      function lineNumberFor(options, i) {
        return String(options.lineNumberFormatter(i + options.firstLineNumber))
      }

      // A Pos instance represents a position within the text.
      function Pos(line, ch, sticky) {
        if (sticky === void 0) sticky = null;

        if (!(this instanceof Pos)) {
          return new Pos(line, ch, sticky)
        }
        this.line = line;
        this.ch = ch;
        this.sticky = sticky;
      }

      // Compare two positions, return 0 if they are the same, a negative
      // number when a is less, and a positive number otherwise.
      function cmp(a, b) {
        return a.line - b.line || a.ch - b.ch
      }

      function equalCursorPos(a, b) {
        return a.sticky == b.sticky && cmp(a, b) == 0
      }

      function copyPos(x) {
        return Pos(x.line, x.ch)
      }

      function maxPos(a, b) {
        return cmp(a, b) < 0 ? b : a
      }

      function minPos(a, b) {
        return cmp(a, b) < 0 ? a : b
      }

      // Most of the external API clips given positions to make sure they
      // actually exist within the document.
      function clipLine(doc, n) {
        return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))
      }

      function clipPos(doc, pos) {
        if (pos.line < doc.first) {
          return Pos(doc.first, 0)
        }
        var last = doc.first + doc.size - 1;
        if (pos.line > last) {
          return Pos(last, getLine(doc, last).text.length)
        }
        return clipToLen(pos, getLine(doc, pos.line).text.length)
      }

      function clipToLen(pos, linelen) {
        var ch = pos.ch;
        if (ch == null || ch > linelen) {
          return Pos(pos.line, linelen)
        } else if (ch < 0) {
          return Pos(pos.line, 0)
        } else {
          return pos
        }
      }

      function clipPosArray(doc, array) {
        var out = [];
        for (var i = 0; i < array.length; i++) {
          out[i] = clipPos(doc, array[i]);
        }
        return out
      }

      // Optimize some code when these features are not used.
      var sawReadOnlySpans = false;
      var sawCollapsedSpans = false;

      function seeReadOnlySpans() {
        sawReadOnlySpans = true;
      }

      function seeCollapsedSpans() {
        sawCollapsedSpans = true;
      }

      // TEXTMARKER SPANS

      function MarkedSpan(marker, from, to) {
        this.marker = marker;
        this.from = from;
        this.to = to;
      }

      // Search an array of spans for a span matching the given marker.
      function getMarkedSpanFor(spans, marker) {
        if (spans) {
          for (var i = 0; i < spans.length; ++i) {
            var span = spans[i];
            if (span.marker == marker) {
              return span
            }
          }
        }
      }
      // Remove a span from an array, returning undefined if no spans are
      // left (we don't store arrays for lines without spans).
      function removeMarkedSpan(spans, span) {
        var r;
        for (var i = 0; i < spans.length; ++i) {
          if (spans[i] != span) {
            (r || (r = [])).push(spans[i]);
          }
        }
        return r
      }
      // Add a span to a line.
      function addMarkedSpan(line, span) {
        line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
        span.marker.attachLine(line);
      }

      // Used for the algorithm that adjusts markers for a change in the
      // document. These functions cut an array of spans at a given
      // character position, returning an array of remaining chunks (or
      // undefined if nothing remains).
      function markedSpansBefore(old, startCh, isInsert) {
        var nw;
        if (old) {
          for (var i = 0; i < old.length; ++i) {
            var span = old[i],
              marker = span.marker;
            var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
            if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
              var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);
              (nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));
            }
          }
        }
        return nw
      }

      function markedSpansAfter(old, endCh, isInsert) {
        var nw;
        if (old) {
          for (var i = 0; i < old.length; ++i) {
            var span = old[i],
              marker = span.marker;
            var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
            if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
              var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);
              (nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
                span.to == null ? null : span.to - endCh));
            }
          }
        }
        return nw
      }

      // Given a change object, compute the new set of marker spans that
      // cover the line in which the change took place. Removes spans
      // entirely within the change, reconnects spans belonging to the
      // same marker that appear on both sides of the change, and cuts off
      // spans partially within the change. Returns an array of span
      // arrays with one element for each line in (after) the change.
      function stretchSpansOverChange(doc, change) {
        if (change.full) {
          return null
        }
        var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
        var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
        if (!oldFirst && !oldLast) {
          return null
        }

        var startCh = change.from.ch,
          endCh = change.to.ch,
          isInsert = cmp(change.from, change.to) == 0;
        // Get the spans that 'stick out' on both sides
        var first = markedSpansBefore(oldFirst, startCh, isInsert);
        var last = markedSpansAfter(oldLast, endCh, isInsert);

        // Next, merge those two ends
        var sameLine = change.text.length == 1,
          offset = lst(change.text).length + (sameLine ? startCh : 0);
        if (first) {
          // Fix up .to properties of first
          for (var i = 0; i < first.length; ++i) {
            var span = first[i];
            if (span.to == null) {
              var found = getMarkedSpanFor(last, span.marker);
              if (!found) {
                span.to = startCh;
              } else if (sameLine) {
                span.to = found.to == null ? null : found.to + offset;
              }
            }
          }
        }
        if (last) {
          // Fix up .from in last (or move them into first in case of sameLine)
          for (var i$1 = 0; i$1 < last.length; ++i$1) {
            var span$1 = last[i$1];
            if (span$1.to != null) {
              span$1.to += offset;
            }
            if (span$1.from == null) {
              var found$1 = getMarkedSpanFor(first, span$1.marker);
              if (!found$1) {
                span$1.from = offset;
                if (sameLine) {
                  (first || (first = [])).push(span$1);
                }
              }
            } else {
              span$1.from += offset;
              if (sameLine) {
                (first || (first = [])).push(span$1);
              }
            }
          }
        }
        // Make sure we didn't create any zero-length spans
        if (first) {
          first = clearEmptySpans(first);
        }
        if (last && last != first) {
          last = clearEmptySpans(last);
        }

        var newMarkers = [first];
        if (!sameLine) {
          // Fill gap with whole-line-spans
          var gap = change.text.length - 2,
            gapMarkers;
          if (gap > 0 && first) {
            for (var i$2 = 0; i$2 < first.length; ++i$2) {
              if (first[i$2].to == null) {
                (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null));
              }
            }
          }
          for (var i$3 = 0; i$3 < gap; ++i$3) {
            newMarkers.push(gapMarkers);
          }
          newMarkers.push(last);
        }
        return newMarkers
      }

      // Remove spans that are empty and don't have a clearWhenEmpty
      // option of false.
      function clearEmptySpans(spans) {
        for (var i = 0; i < spans.length; ++i) {
          var span = spans[i];
          if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false) {
            spans.splice(i--, 1);
          }
        }
        if (!spans.length) {
          return null
        }
        return spans
      }

      // Used to 'clip' out readOnly ranges when making a change.
      function removeReadOnlyRanges(doc, from, to) {
        var markers = null;
        doc.iter(from.line, to.line + 1, function(line) {
          if (line.markedSpans) {
            for (var i = 0; i < line.markedSpans.length; ++i) {
              var mark = line.markedSpans[i].marker;
              if (mark.readOnly && (!markers || indexOf(markers, mark) == -1)) {
                (markers || (markers = [])).push(mark);
              }
            }
          }
        });
        if (!markers) {
          return null
        }
        var parts = [{
          from: from,
          to: to
        }];
        for (var i = 0; i < markers.length; ++i) {
          var mk = markers[i],
            m = mk.find(0);
          for (var j = 0; j < parts.length; ++j) {
            var p = parts[j];
            if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) {
              continue
            }
            var newParts = [j, 1],
              dfrom = cmp(p.from, m.from),
              dto = cmp(p.to, m.to);
            if (dfrom < 0 || !mk.inclusiveLeft && !dfrom) {
              newParts.push({
                from: p.from,
                to: m.from
              });
            }
            if (dto > 0 || !mk.inclusiveRight && !dto) {
              newParts.push({
                from: m.to,
                to: p.to
              });
            }
            parts.splice.apply(parts, newParts);
            j += newParts.length - 3;
          }
        }
        return parts
      }

      // Connect or disconnect spans from a line.
      function detachMarkedSpans(line) {
        var spans = line.markedSpans;
        if (!spans) {
          return
        }
        for (var i = 0; i < spans.length; ++i) {
          spans[i].marker.detachLine(line);
        }
        line.markedSpans = null;
      }

      function attachMarkedSpans(line, spans) {
        if (!spans) {
          return
        }
        for (var i = 0; i < spans.length; ++i) {
          spans[i].marker.attachLine(line);
        }
        line.markedSpans = spans;
      }

      // Helpers used when computing which overlapping collapsed span
      // counts as the larger one.
      function extraLeft(marker) {
        return marker.inclusiveLeft ? -1 : 0
      }

      function extraRight(marker) {
        return marker.inclusiveRight ? 1 : 0
      }

      // Returns a number indicating which of two overlapping collapsed
      // spans is larger (and thus includes the other). Falls back to
      // comparing ids when the spans cover exactly the same range.
      function compareCollapsedMarkers(a, b) {
        var lenDiff = a.lines.length - b.lines.length;
        if (lenDiff != 0) {
          return lenDiff
        }
        var aPos = a.find(),
          bPos = b.find();
        var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
        if (fromCmp) {
          return -fromCmp
        }
        var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
        if (toCmp) {
          return toCmp
        }
        return b.id - a.id
      }

      // Find out whether a line ends or starts in a collapsed span. If
      // so, return the marker for that span.
      function collapsedSpanAtSide(line, start) {
        var sps = sawCollapsedSpans && line.markedSpans,
          found;
        if (sps) {
          for (var sp = (void 0), i = 0; i < sps.length; ++i) {
            sp = sps[i];
            if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
              (!found || compareCollapsedMarkers(found, sp.marker) < 0)) {
              found = sp.marker;
            }
          }
        }
        return found
      }

      function collapsedSpanAtStart(line) {
        return collapsedSpanAtSide(line, true)
      }

      function collapsedSpanAtEnd(line) {
        return collapsedSpanAtSide(line, false)
      }

      // Test whether there exists a collapsed span that partially
      // overlaps (covers the start or end, but not both) of a new span.
      // Such overlap is not allowed.
      function conflictingCollapsedRange(doc, lineNo$$1, from, to, marker) {
        var line = getLine(doc, lineNo$$1);
        var sps = sawCollapsedSpans && line.markedSpans;
        if (sps) {
          for (var i = 0; i < sps.length; ++i) {
            var sp = sps[i];
            if (!sp.marker.collapsed) {
              continue
            }
            var found = sp.marker.find(0);
            var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
            var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
            if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) {
              continue
            }
            if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||
              fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0)) {
              return true
            }
          }
        }
      }

      // A visual line is a line as drawn on the screen. Folding, for
      // example, can cause multiple logical lines to appear on the same
      // visual line. This finds the start of the visual line that the
      // given line is part of (usually that is the line itself).
      function visualLine(line) {
        var merged;
        while (merged = collapsedSpanAtStart(line)) {
          line = merged.find(-1, true).line;
        }
        return line
      }

      function visualLineEnd(line) {
        var merged;
        while (merged = collapsedSpanAtEnd(line)) {
          line = merged.find(1, true).line;
        }
        return line
      }

      // Returns an array of logical lines that continue the visual line
      // started by the argument, or undefined if there are no such lines.
      function visualLineContinued(line) {
        var merged, lines;
        while (merged = collapsedSpanAtEnd(line)) {
          line = merged.find(1, true).line;
          (lines || (lines = [])).push(line);
        }
        return lines
      }

      // Get the line number of the start of the visual line that the
      // given line number is part of.
      function visualLineNo(doc, lineN) {
        var line = getLine(doc, lineN),
          vis = visualLine(line);
        if (line == vis) {
          return lineN
        }
        return lineNo(vis)
      }

      // Get the line number of the start of the next visual line after
      // the given line.
      function visualLineEndNo(doc, lineN) {
        if (lineN > doc.lastLine()) {
          return lineN
        }
        var line = getLine(doc, lineN),
          merged;
        if (!lineIsHidden(doc, line)) {
          return lineN
        }
        while (merged = collapsedSpanAtEnd(line)) {
          line = merged.find(1, true).line;
        }
        return lineNo(line) + 1
      }

      // Compute whether a line is hidden. Lines count as hidden when they
      // are part of a visual line that starts with another line, or when
      // they are entirely covered by collapsed, non-widget span.
      function lineIsHidden(doc, line) {
        var sps = sawCollapsedSpans && line.markedSpans;
        if (sps) {
          for (var sp = (void 0), i = 0; i < sps.length; ++i) {
            sp = sps[i];
            if (!sp.marker.collapsed) {
              continue
            }
            if (sp.from == null) {
              return true
            }
            if (sp.marker.widgetNode) {
              continue
            }
            if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp)) {
              return true
            }
          }
        }
      }

      function lineIsHiddenInner(doc, line, span) {
        if (span.to == null) {
          var end = span.marker.find(1, true);
          return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))
        }
        if (span.marker.inclusiveRight && span.to == line.text.length) {
          return true
        }
        for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {
          sp = line.markedSpans[i];
          if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
            (sp.to == null || sp.to != span.from) &&
            (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
            lineIsHiddenInner(doc, line, sp)) {
            return true
          }
        }
      }

      // Find the height above the given line.
      function heightAtLine(lineObj) {
        lineObj = visualLine(lineObj);

        var h = 0,
          chunk = lineObj.parent;
        for (var i = 0; i < chunk.lines.length; ++i) {
          var line = chunk.lines[i];
          if (line == lineObj) {
            break
          } else {
            h += line.height;
          }
        }
        for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
          for (var i$1 = 0; i$1 < p.children.length; ++i$1) {
            var cur = p.children[i$1];
            if (cur == chunk) {
              break
            } else {
              h += cur.height;
            }
          }
        }
        return h
      }

      // Compute the character length of a line, taking into account
      // collapsed ranges (see markText) that might hide parts, and join
      // other lines onto it.
      function lineLength(line) {
        if (line.height == 0) {
          return 0
        }
        var len = line.text.length,
          merged, cur = line;
        while (merged = collapsedSpanAtStart(cur)) {
          var found = merged.find(0, true);
          cur = found.from.line;
          len += found.from.ch - found.to.ch;
        }
        cur = line;
        while (merged = collapsedSpanAtEnd(cur)) {
          var found$1 = merged.find(0, true);
          len -= cur.text.length - found$1.from.ch;
          cur = found$1.to.line;
          len += cur.text.length - found$1.to.ch;
        }
        return len
      }

      // Find the longest line in the document.
      function findMaxLine(cm) {
        var d = cm.display,
          doc = cm.doc;
        d.maxLine = getLine(doc, doc.first);
        d.maxLineLength = lineLength(d.maxLine);
        d.maxLineChanged = true;
        doc.iter(function(line) {
          var len = lineLength(line);
          if (len > d.maxLineLength) {
            d.maxLineLength = len;
            d.maxLine = line;
          }
        });
      }

      // BIDI HELPERS

      function iterateBidiSections(order, from, to, f) {
        if (!order) {
          return f(from, to, "ltr", 0)
        }
        var found = false;
        for (var i = 0; i < order.length; ++i) {
          var part = order[i];
          if (part.from < to && part.to > from || from == to && part.to == from) {
            f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr", i);
            found = true;
          }
        }
        if (!found) {
          f(from, to, "ltr");
        }
      }

      var bidiOther = null;

      function getBidiPartAt(order, ch, sticky) {
        var found;
        bidiOther = null;
        for (var i = 0; i < order.length; ++i) {
          var cur = order[i];
          if (cur.from < ch && cur.to > ch) {
            return i
          }
          if (cur.to == ch) {
            if (cur.from != cur.to && sticky == "before") {
              found = i;
            } else {
              bidiOther = i;
            }
          }
          if (cur.from == ch) {
            if (cur.from != cur.to && sticky != "before") {
              found = i;
            } else {
              bidiOther = i;
            }
          }
        }
        return found != null ? found : bidiOther
      }

      // Bidirectional ordering algorithm
      // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
      // that this (partially) implements.

      // One-char codes used for character types:
      // L (L):   Left-to-Right
      // R (R):   Right-to-Left
      // r (AL):  Right-to-Left Arabic
      // 1 (EN):  European Number
      // + (ES):  European Number Separator
      // % (ET):  European Number Terminator
      // n (AN):  Arabic Number
      // , (CS):  Common Number Separator
      // m (NSM): Non-Spacing Mark
      // b (BN):  Boundary Neutral
      // s (B):   Paragraph Separator
      // t (S):   Segment Separator
      // w (WS):  Whitespace
      // N (ON):  Other Neutrals

      // Returns null if characters are ordered as they appear
      // (left-to-right), or an array of sections ({from, to, level}
      // objects) in the order in which they occur visually.
      var bidiOrdering = (function() {
        // Character types for codepoints 0 to 0xff
        var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
        // Character types for codepoints 0x600 to 0x6f9
        var arabicTypes = "nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111";

        function charType(code) {
          if (code <= 0xf7) {
            return lowTypes.charAt(code)
          } else if (0x590 <= code && code <= 0x5f4) {
            return "R"
          } else if (0x600 <= code && code <= 0x6f9) {
            return arabicTypes.charAt(code - 0x600)
          } else if (0x6ee <= code && code <= 0x8ac) {
            return "r"
          } else if (0x2000 <= code && code <= 0x200b) {
            return "w"
          } else if (code == 0x200c) {
            return "b"
          } else {
            return "L"
          }
        }

        var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
        var isNeutral = /[stwN]/,
          isStrong = /[LRr]/,
          countsAsLeft = /[Lb1n]/,
          countsAsNum = /[1n]/;

        function BidiSpan(level, from, to) {
          this.level = level;
          this.from = from;
          this.to = to;
        }

        return function(str, direction) {
          var outerType = direction == "ltr" ? "L" : "R";

          if (str.length == 0 || direction == "ltr" && !bidiRE.test(str)) {
            return false
          }
          var len = str.length,
            types = [];
          for (var i = 0; i < len; ++i) {
            types.push(charType(str.charCodeAt(i)));
          }

          // W1. Examine each non-spacing mark (NSM) in the level run, and
          // change the type of the NSM to the type of the previous
          // character. If the NSM is at the start of the level run, it will
          // get the type of sor.
          for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {
            var type = types[i$1];
            if (type == "m") {
              types[i$1] = prev;
            } else {
              prev = type;
            }
          }

          // W2. Search backwards from each instance of a European number
          // until the first strong type (R, L, AL, or sor) is found. If an
          // AL is found, change the type of the European number to Arabic
          // number.
          // W3. Change all ALs to R.
          for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {
            var type$1 = types[i$2];
            if (type$1 == "1" && cur == "r") {
              types[i$2] = "n";
            } else if (isStrong.test(type$1)) {
              cur = type$1;
              if (type$1 == "r") {
                types[i$2] = "R";
              }
            }
          }

          // W4. A single European separator between two European numbers
          // changes to a European number. A single common separator between
          // two numbers of the same type changes to that type.
          for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {
            var type$2 = types[i$3];
            if (type$2 == "+" && prev$1 == "1" && types[i$3 + 1] == "1") {
              types[i$3] = "1";
            } else if (type$2 == "," && prev$1 == types[i$3 + 1] &&
              (prev$1 == "1" || prev$1 == "n")) {
              types[i$3] = prev$1;
            }
            prev$1 = type$2;
          }

          // W5. A sequence of European terminators adjacent to European
          // numbers changes to all European numbers.
          // W6. Otherwise, separators and terminators change to Other
          // Neutral.
          for (var i$4 = 0; i$4 < len; ++i$4) {
            var type$3 = types[i$4];
            if (type$3 == ",") {
              types[i$4] = "N";
            } else if (type$3 == "%") {
              var end = (void 0);
              for (end = i$4 + 1; end < len && types[end] == "%"; ++end) {}
              var replace = (i$4 && types[i$4 - 1] == "!") || (end < len && types[end] == "1") ? "1" : "N";
              for (var j = i$4; j < end; ++j) {
                types[j] = replace;
              }
              i$4 = end - 1;
            }
          }

          // W7. Search backwards from each instance of a European number
          // until the first strong type (R, L, or sor) is found. If an L is
          // found, then change the type of the European number to L.
          for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {
            var type$4 = types[i$5];
            if (cur$1 == "L" && type$4 == "1") {
              types[i$5] = "L";
            } else if (isStrong.test(type$4)) {
              cur$1 = type$4;
            }
          }

          // N1. A sequence of neutrals takes the direction of the
          // surrounding strong text if the text on both sides has the same
          // direction. European and Arabic numbers act as if they were R in
          // terms of their influence on neutrals. Start-of-level-run (sor)
          // and end-of-level-run (eor) are used at level run boundaries.
          // N2. Any remaining neutrals take the embedding direction.
          for (var i$6 = 0; i$6 < len; ++i$6) {
            if (isNeutral.test(types[i$6])) {
              var end$1 = (void 0);
              for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) {}
              var before = (i$6 ? types[i$6 - 1] : outerType) == "L";
              var after = (end$1 < len ? types[end$1] : outerType) == "L";
              var replace$1 = before == after ? (before ? "L" : "R") : outerType;
              for (var j$1 = i$6; j$1 < end$1; ++j$1) {
                types[j$1] = replace$1;
              }
              i$6 = end$1 - 1;
            }
          }

          // Here we depart from the documented algorithm, in order to avoid
          // building up an actual levels array. Since there are only three
          // levels (0, 1, 2) in an implementation that doesn't take
          // explicit embedding into account, we can build up the order on
          // the fly, without following the level-based algorithm.
          var order = [],
            m;
          for (var i$7 = 0; i$7 < len;) {
            if (countsAsLeft.test(types[i$7])) {
              var start = i$7;
              for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {}
              order.push(new BidiSpan(0, start, i$7));
            } else {
              var pos = i$7,
                at = order.length;
              for (++i$7; i$7 < len && types[i$7] != "L"; ++i$7) {}
              for (var j$2 = pos; j$2 < i$7;) {
                if (countsAsNum.test(types[j$2])) {
                  if (pos < j$2) {
                    order.splice(at, 0, new BidiSpan(1, pos, j$2));
                  }
                  var nstart = j$2;
                  for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {}
                  order.splice(at, 0, new BidiSpan(2, nstart, j$2));
                  pos = j$2;
                } else {
                  ++j$2;
                }
              }
              if (pos < i$7) {
                order.splice(at, 0, new BidiSpan(1, pos, i$7));
              }
            }
          }
          if (direction == "ltr") {
            if (order[0].level == 1 && (m = str.match(/^\s+/))) {
              order[0].from = m[0].length;
              order.unshift(new BidiSpan(0, 0, m[0].length));
            }
            if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
              lst(order).to -= m[0].length;
              order.push(new BidiSpan(0, len - m[0].length, len));
            }
          }

          return direction == "rtl" ? order.reverse() : order
        }
      })();

      // Get the bidi ordering for the given line (and cache it). Returns
      // false for lines that are fully left-to-right, and an array of
      // BidiSpan objects otherwise.
      function getOrder(line, direction) {
        var order = line.order;
        if (order == null) {
          order = line.order = bidiOrdering(line.text, direction);
        }
        return order
      }

      // EVENT HANDLING

      // Lightweight event framework. on/off also work on DOM nodes,
      // registering native DOM handlers.

      var noHandlers = [];

      var on = function(emitter, type, f) {
        if (emitter.addEventListener) {
          emitter.addEventListener(type, f, false);
        } else if (emitter.attachEvent) {
          emitter.attachEvent("on" + type, f);
        } else {
          var map$$1 = emitter._handlers || (emitter._handlers = {});
          map$$1[type] = (map$$1[type] || noHandlers).concat(f);
        }
      };

      function getHandlers(emitter, type) {
        return emitter._handlers && emitter._handlers[type] || noHandlers
      }

      function off(emitter, type, f) {
        if (emitter.removeEventListener) {
          emitter.removeEventListener(type, f, false);
        } else if (emitter.detachEvent) {
          emitter.detachEvent("on" + type, f);
        } else {
          var map$$1 = emitter._handlers,
            arr = map$$1 && map$$1[type];
          if (arr) {
            var index = indexOf(arr, f);
            if (index > -1) {
              map$$1[type] = arr.slice(0, index).concat(arr.slice(index + 1));
            }
          }
        }
      }

      function signal(emitter, type /*, values...*/ ) {
        var handlers = getHandlers(emitter, type);
        if (!handlers.length) {
          return
        }
        var args = Array.prototype.slice.call(arguments, 2);
        for (var i = 0; i < handlers.length; ++i) {
          handlers[i].apply(null, args);
        }
      }

      // The DOM events that CodeMirror handles can be overridden by
      // registering a (non-DOM) handler on the editor for the event name,
      // and preventDefault-ing the event in that handler.
      function signalDOMEvent(cm, e, override) {
        if (typeof e == "string") {
          e = {
            type: e,
            preventDefault: function() {
              this.defaultPrevented = true;
            }
          };
        }
        signal(cm, override || e.type, cm, e);
        return e_defaultPrevented(e) || e.codemirrorIgnore
      }

      function signalCursorActivity(cm) {
        var arr = cm._handlers && cm._handlers.cursorActivity;
        if (!arr) {
          return
        }
        var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
        for (var i = 0; i < arr.length; ++i) {
          if (indexOf(set, arr[i]) == -1) {
            set.push(arr[i]);
          }
        }
      }

      function hasHandler(emitter, type) {
        return getHandlers(emitter, type).length > 0
      }

      // Add on and off methods to a constructor's prototype, to make
      // registering events on such objects more convenient.
      function eventMixin(ctor) {
        ctor.prototype.on = function(type, f) {
          on(this, type, f);
        };
        ctor.prototype.off = function(type, f) {
          off(this, type, f);
        };
      }

      // Due to the fact that we still support jurassic IE versions, some
      // compatibility wrappers are needed.

      function e_preventDefault(e) {
        if (e.preventDefault) {
          e.preventDefault();
        } else {
          e.returnValue = false;
        }
      }

      function e_stopPropagation(e) {
        if (e.stopPropagation) {
          e.stopPropagation();
        } else {
          e.cancelBubble = true;
        }
      }

      function e_defaultPrevented(e) {
        return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
      }

      function e_stop(e) {
        e_preventDefault(e);
        e_stopPropagation(e);
      }

      function e_target(e) {
        return e.target || e.srcElement
      }

      function e_button(e) {
        var b = e.which;
        if (b == null) {
          if (e.button & 1) {
            b = 1;
          } else if (e.button & 2) {
            b = 3;
          } else if (e.button & 4) {
            b = 2;
          }
        }
        if (mac && e.ctrlKey && b == 1) {
          b = 3;
        }
        return b
      }

      // Detect drag-and-drop
      var dragAndDrop = function() {
        // There is *some* kind of drag-and-drop support in IE6-8, but I
        // couldn't get it to work yet.
        if (ie && ie_version < 9) {
          return false
        }
        var div = elt('div');
        return "draggable" in div || "dragDrop" in div
      }();

      var zwspSupported;

      function zeroWidthElement(measure) {
        if (zwspSupported == null) {
          var test = elt("span", "\u200b");
          removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
          if (measure.firstChild.offsetHeight != 0) {
            zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8);
          }
        }
        var node = zwspSupported ? elt("span", "\u200b") :
          elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
        node.setAttribute("cm-text", "");
        return node
      }

      // Feature-detect IE's crummy client rect reporting for bidi text
      var badBidiRects;

      function hasBadBidiRects(measure) {
        if (badBidiRects != null) {
          return badBidiRects
        }
        var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
        var r0 = range(txt, 0, 1).getBoundingClientRect();
        var r1 = range(txt, 1, 2).getBoundingClientRect();
        removeChildren(measure);
        if (!r0 || r0.left == r0.right) {
          return false
        } // Safari returns null in some cases (#2780)
        return badBidiRects = (r1.right - r0.right < 3)
      }

      // See if "".split is the broken IE version, if so, provide an
      // alternative way to split lines.
      var splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? function(string) {
        var pos = 0,
          result = [],
          l = string.length;
        while (pos <= l) {
          var nl = string.indexOf("\n", pos);
          if (nl == -1) {
            nl = string.length;
          }
          var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
          var rt = line.indexOf("\r");
          if (rt != -1) {
            result.push(line.slice(0, rt));
            pos += rt + 1;
          } else {
            result.push(line);
            pos = nl + 1;
          }
        }
        return result
      } : function(string) {
        return string.split(/\r\n?|\n/);
      };

      var hasSelection = window.getSelection ? function(te) {
        try {
          return te.selectionStart != te.selectionEnd
        } catch (e) {
          return false
        }
      } : function(te) {
        var range$$1;
        try {
          range$$1 = te.ownerDocument.selection.createRange();
        } catch (e) {}
        if (!range$$1 || range$$1.parentElement() != te) {
          return false
        }
        return range$$1.compareEndPoints("StartToEnd", range$$1) != 0
      };

      var hasCopyEvent = (function() {
        var e = elt("div");
        if ("oncopy" in e) {
          return true
        }
        e.setAttribute("oncopy", "return;");
        return typeof e.oncopy == "function"
      })();

      var badZoomedRects = null;

      function hasBadZoomedRects(measure) {
        if (badZoomedRects != null) {
          return badZoomedRects
        }
        var node = removeChildrenAndAdd(measure, elt("span", "x"));
        var normal = node.getBoundingClientRect();
        var fromRange = range(node, 0, 1).getBoundingClientRect();
        return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1
      }

      // Known modes, by name and by MIME
      var modes = {};
      var mimeModes = {};

      // Extra arguments are stored as the mode's dependencies, which is
      // used by (legacy) mechanisms like loadmode.js to automatically
      // load a mode. (Preferred mechanism is the require/define calls.)
      function defineMode(name, mode) {
        if (arguments.length > 2) {
          mode.dependencies = Array.prototype.slice.call(arguments, 2);
        }
        modes[name] = mode;
      }

      function defineMIME(mime, spec) {
        mimeModes[mime] = spec;
      }

      // Given a MIME type, a {name, ...options} config object, or a name
      // string, return a mode config object.
      function resolveMode(spec) {
        if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
          spec = mimeModes[spec];
        } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
          var found = mimeModes[spec.name];
          if (typeof found == "string") {
            found = {
              name: found
            };
          }
          spec = createObj(found, spec);
          spec.name = found.name;
        } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
          return resolveMode("application/xml")
        } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+json$/.test(spec)) {
          return resolveMode("application/json")
        }
        if (typeof spec == "string") {
          return {
            name: spec
          }
        } else {
          return spec || {
            name: "null"
          }
        }
      }

      // Given a mode spec (anything that resolveMode accepts), find and
      // initialize an actual mode object.
      function getMode(options, spec) {
        spec = resolveMode(spec);
        var mfactory = modes[spec.name];
        if (!mfactory) {
          return getMode(options, "text/plain")
        }
        var modeObj = mfactory(options, spec);
        if (modeExtensions.hasOwnProperty(spec.name)) {
          var exts = modeExtensions[spec.name];
          for (var prop in exts) {
            if (!exts.hasOwnProperty(prop)) {
              continue
            }
            if (modeObj.hasOwnProperty(prop)) {
              modeObj["_" + prop] = modeObj[prop];
            }
            modeObj[prop] = exts[prop];
          }
        }
        modeObj.name = spec.name;
        if (spec.helperType) {
          modeObj.helperType = spec.helperType;
        }
        if (spec.modeProps) {
          for (var prop$1 in spec.modeProps) {
            modeObj[prop$1] = spec.modeProps[prop$1];
          }
        }

        return modeObj
      }

      // This can be used to attach properties to mode objects from
      // outside the actual mode definition.
      var modeExtensions = {};

      function extendMode(mode, properties) {
        var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
        copyObj(properties, exts);
      }

      function copyState(mode, state) {
        if (state === true) {
          return state
        }
        if (mode.copyState) {
          return mode.copyState(state)
        }
        var nstate = {};
        for (var n in state) {
          var val = state[n];
          if (val instanceof Array) {
            val = val.concat([]);
          }
          nstate[n] = val;
        }
        return nstate
      }

      // Given a mode and a state (for that mode), find the inner mode and
      // state at the position that the state refers to.
      function innerMode(mode, state) {
        var info;
        while (mode.innerMode) {
          info = mode.innerMode(state);
          if (!info || info.mode == mode) {
            break
          }
          state = info.state;
          mode = info.mode;
        }
        return info || {
          mode: mode,
          state: state
        }
      }

      function startState(mode, a1, a2) {
        return mode.startState ? mode.startState(a1, a2) : true
      }

      // STRING STREAM

      // Fed to the mode parsers, provides helper functions to make
      // parsers more succinct.

      var StringStream = function(string, tabSize, lineOracle) {
        this.pos = this.start = 0;
        this.string = string;
        this.tabSize = tabSize || 8;
        this.lastColumnPos = this.lastColumnValue = 0;
        this.lineStart = 0;
        this.lineOracle = lineOracle;
      };

      StringStream.prototype.eol = function() {
        return this.pos >= this.string.length
      };
      StringStream.prototype.sol = function() {
        return this.pos == this.lineStart
      };
      StringStream.prototype.peek = function() {
        return this.string.charAt(this.pos) || undefined
      };
      StringStream.prototype.next = function() {
        if (this.pos < this.string.length) {
          return this.string.charAt(this.pos++)
        }
      };
      StringStream.prototype.eat = function(match) {
        var ch = this.string.charAt(this.pos);
        var ok;
        if (typeof match == "string") {
          ok = ch == match;
        } else {
          ok = ch && (match.test ? match.test(ch) : match(ch));
        }
        if (ok) {
          ++this.pos;
          return ch
        }
      };
      StringStream.prototype.eatWhile = function(match) {
        var start = this.pos;
        while (this.eat(match)) {}
        return this.pos > start
      };
      StringStream.prototype.eatSpace = function() {
        var this$1 = this;

        var start = this.pos;
        while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) {
          ++this$1.pos;
        }
        return this.pos > start
      };
      StringStream.prototype.skipToEnd = function() {
        this.pos = this.string.length;
      };
      StringStream.prototype.skipTo = function(ch) {
        var found = this.string.indexOf(ch, this.pos);
        if (found > -1) {
          this.pos = found;
          return true
        }
      };
      StringStream.prototype.backUp = function(n) {
        this.pos -= n;
      };
      StringStream.prototype.column = function() {
        if (this.lastColumnPos < this.start) {
          this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
          this.lastColumnPos = this.start;
        }
        return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
      };
      StringStream.prototype.indentation = function() {
        return countColumn(this.string, null, this.tabSize) -
          (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
      };
      StringStream.prototype.match = function(pattern, consume, caseInsensitive) {
        if (typeof pattern == "string") {
          var cased = function(str) {
            return caseInsensitive ? str.toLowerCase() : str;
          };
          var substr = this.string.substr(this.pos, pattern.length);
          if (cased(substr) == cased(pattern)) {
            if (consume !== false) {
              this.pos += pattern.length;
            }
            return true
          }
        } else {
          var match = this.string.slice(this.pos).match(pattern);
          if (match && match.index > 0) {
            return null
          }
          if (match && consume !== false) {
            this.pos += match[0].length;
          }
          return match
        }
      };
      StringStream.prototype.current = function() {
        return this.string.slice(this.start, this.pos)
      };
      StringStream.prototype.hideFirstChars = function(n, inner) {
        this.lineStart += n;
        try {
          return inner()
        } finally {
          this.lineStart -= n;
        }
      };
      StringStream.prototype.lookAhead = function(n) {
        var oracle = this.lineOracle;
        return oracle && oracle.lookAhead(n)
      };
      StringStream.prototype.baseToken = function() {
        var oracle = this.lineOracle;
        return oracle && oracle.baseToken(this.pos)
      };

      var SavedContext = function(state, lookAhead) {
        this.state = state;
        this.lookAhead = lookAhead;
      };

      var Context = function(doc, state, line, lookAhead) {
        this.state = state;
        this.doc = doc;
        this.line = line;
        this.maxLookAhead = lookAhead || 0;
        this.baseTokens = null;
        this.baseTokenPos = 1;
      };

      Context.prototype.lookAhead = function(n) {
        var line = this.doc.getLine(this.line + n);
        if (line != null && n > this.maxLookAhead) {
          this.maxLookAhead = n;
        }
        return line
      };

      Context.prototype.baseToken = function(n) {
        var this$1 = this;

        if (!this.baseTokens) {
          return null
        }
        while (this.baseTokens[this.baseTokenPos] <= n) {
          this$1.baseTokenPos += 2;
        }
        var type = this.baseTokens[this.baseTokenPos + 1];
        return {
          type: type && type.replace(/( |^)overlay .*/, ""),
          size: this.baseTokens[this.baseTokenPos] - n
        }
      };

      Context.prototype.nextLine = function() {
        this.line++;
        if (this.maxLookAhead > 0) {
          this.maxLookAhead--;
        }
      };

      Context.fromSaved = function(doc, saved, line) {
        if (saved instanceof SavedContext) {
          return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead)
        } else {
          return new Context(doc, copyState(doc.mode, saved), line)
        }
      };

      Context.prototype.save = function(copy) {
        var state = copy !== false ? copyState(this.doc.mode, this.state) : this.state;
        return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state
      };


      // Compute a style array (an array starting with a mode generation
      // -- for invalidation -- followed by pairs of end positions and
      // style strings), which is used to highlight the tokens on the
      // line.
      function highlightLine(cm, line, context, forceToEnd) {
        // A styles array always starts with a number identifying the
        // mode/overlays that it is based on (for easy invalidation).
        var st = [cm.state.modeGen],
          lineClasses = {};
        // Compute the base array of styles
        runMode(cm, line.text, cm.doc.mode, context, function(end, style) {
            return st.push(end, style);
          },
          lineClasses, forceToEnd);
        var state = context.state;

        // Run overlays, adjust style array.
        var loop = function(o) {
          context.baseTokens = st;
          var overlay = cm.state.overlays[o],
            i = 1,
            at = 0;
          context.state = true;
          runMode(cm, line.text, overlay.mode, context, function(end, style) {
            var start = i;
            // Ensure there's a token end at the current position, and that i points at it
            while (at < end) {
              var i_end = st[i];
              if (i_end > end) {
                st.splice(i, 1, end, st[i + 1], i_end);
              }
              i += 2;
              at = Math.min(end, i_end);
            }
            if (!style) {
              return
            }
            if (overlay.opaque) {
              st.splice(start, i - start, end, "overlay " + style);
              i = start + 2;
            } else {
              for (; start < i; start += 2) {
                var cur = st[start + 1];
                st[start + 1] = (cur ? cur + " " : "") + "overlay " + style;
              }
            }
          }, lineClasses);
          context.state = state;
          context.baseTokens = null;
          context.baseTokenPos = 1;
        };

        for (var o = 0; o < cm.state.overlays.length; ++o) loop(o);

        return {
          styles: st,
          classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null
        }
      }

      function getLineStyles(cm, line, updateFrontier) {
        if (!line.styles || line.styles[0] != cm.state.modeGen) {
          var context = getContextBefore(cm, lineNo(line));
          var resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state);
          var result = highlightLine(cm, line, context);
          if (resetState) {
            context.state = resetState;
          }
          line.stateAfter = context.save(!resetState);
          line.styles = result.styles;
          if (result.classes) {
            line.styleClasses = result.classes;
          } else if (line.styleClasses) {
            line.styleClasses = null;
          }
          if (updateFrontier === cm.doc.highlightFrontier) {
            cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier);
          }
        }
        return line.styles
      }

      function getContextBefore(cm, n, precise) {
        var doc = cm.doc,
          display = cm.display;
        if (!doc.mode.startState) {
          return new Context(doc, true, n)
        }
        var start = findStartLine(cm, n, precise);
        var saved = start > doc.first && getLine(doc, start - 1).stateAfter;
        var context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start);

        doc.iter(start, n, function(line) {
          processLine(cm, line.text, context);
          var pos = context.line;
          line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null;
          context.nextLine();
        });
        if (precise) {
          doc.modeFrontier = context.line;
        }
        return context
      }

      // Lightweight form of highlight -- proceed over this line and
      // update state, but don't save a style array. Used for lines that
      // aren't currently visible.
      function processLine(cm, text, context, startAt) {
        var mode = cm.doc.mode;
        var stream = new StringStream(text, cm.options.tabSize, context);
        stream.start = stream.pos = startAt || 0;
        if (text == "") {
          callBlankLine(mode, context.state);
        }
        while (!stream.eol()) {
          readToken(mode, stream, context.state);
          stream.start = stream.pos;
        }
      }

      function callBlankLine(mode, state) {
        if (mode.blankLine) {
          return mode.blankLine(state)
        }
        if (!mode.innerMode) {
          return
        }
        var inner = innerMode(mode, state);
        if (inner.mode.blankLine) {
          return inner.mode.blankLine(inner.state)
        }
      }

      function readToken(mode, stream, state, inner) {
        for (var i = 0; i < 10; i++) {
          if (inner) {
            inner[0] = innerMode(mode, state).mode;
          }
          var style = mode.token(stream, state);
          if (stream.pos > stream.start) {
            return style
          }
        }
        throw new Error("Mode " + mode.name + " failed to advance stream.")
      }

      var Token = function(stream, type, state) {
        this.start = stream.start;
        this.end = stream.pos;
        this.string = stream.current();
        this.type = type || null;
        this.state = state;
      };

      // Utility for getTokenAt and getLineTokens
      function takeToken(cm, pos, precise, asArray) {
        var doc = cm.doc,
          mode = doc.mode,
          style;
        pos = clipPos(doc, pos);
        var line = getLine(doc, pos.line),
          context = getContextBefore(cm, pos.line, precise);
        var stream = new StringStream(line.text, cm.options.tabSize, context),
          tokens;
        if (asArray) {
          tokens = [];
        }
        while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
          stream.start = stream.pos;
          style = readToken(mode, stream, context.state);
          if (asArray) {
            tokens.push(new Token(stream, style, copyState(doc.mode, context.state)));
          }
        }
        return asArray ? tokens : new Token(stream, style, context.state)
      }

      function extractLineClasses(type, output) {
        if (type) {
          for (;;) {
            var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/);
            if (!lineClass) {
              break
            }
            type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);
            var prop = lineClass[1] ? "bgClass" : "textClass";
            if (output[prop] == null) {
              output[prop] = lineClass[2];
            } else if (!(new RegExp("(?:^|\s)" + lineClass[2] + "(?:$|\s)")).test(output[prop])) {
              output[prop] += " " + lineClass[2];
            }
          }
        }
        return type
      }

      // Run the given mode's parser over a line, calling f for each token.
      function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {
        var flattenSpans = mode.flattenSpans;
        if (flattenSpans == null) {
          flattenSpans = cm.options.flattenSpans;
        }
        var curStart = 0,
          curStyle = null;
        var stream = new StringStream(text, cm.options.tabSize, context),
          style;
        var inner = cm.options.addModeClass && [null];
        if (text == "") {
          extractLineClasses(callBlankLine(mode, context.state), lineClasses);
        }
        while (!stream.eol()) {
          if (stream.pos > cm.options.maxHighlightLength) {
            flattenSpans = false;
            if (forceToEnd) {
              processLine(cm, text, context, stream.pos);
            }
            stream.pos = text.length;
            style = null;
          } else {
            style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses);
          }
          if (inner) {
            var mName = inner[0].name;
            if (mName) {
              style = "m-" + (style ? mName + " " + style : mName);
            }
          }
          if (!flattenSpans || curStyle != style) {
            while (curStart < stream.start) {
              curStart = Math.min(stream.start, curStart + 5000);
              f(curStart, curStyle);
            }
            curStyle = style;
          }
          stream.start = stream.pos;
        }
        while (curStart < stream.pos) {
          // Webkit seems to refuse to render text nodes longer than 57444
          // characters, and returns inaccurate measurements in nodes
          // starting around 5000 chars.
          var pos = Math.min(stream.pos, curStart + 5000);
          f(pos, curStyle);
          curStart = pos;
        }
      }

      // Finds the line to start with when starting a parse. Tries to
      // find a line with a stateAfter, so that it can start with a
      // valid state. If that fails, it returns the line with the
      // smallest indentation, which tends to need the least context to
      // parse correctly.
      function findStartLine(cm, n, precise) {
        var minindent, minline, doc = cm.doc;
        var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
        for (var search = n; search > lim; --search) {
          if (search <= doc.first) {
            return doc.first
          }
          var line = getLine(doc, search - 1),
            after = line.stateAfter;
          if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier)) {
            return search
          }
          var indented = countColumn(line.text, null, cm.options.tabSize);
          if (minline == null || minindent > indented) {
            minline = search - 1;
            minindent = indented;
          }
        }
        return minline
      }

      function retreatFrontier(doc, n) {
        doc.modeFrontier = Math.min(doc.modeFrontier, n);
        if (doc.highlightFrontier < n - 10) {
          return
        }
        var start = doc.first;
        for (var line = n - 1; line > start; line--) {
          var saved = getLine(doc, line).stateAfter;
          // change is on 3
          // state on line 1 looked ahead 2 -- so saw 3
          // test 1 + 2 < 3 should cover this
          if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {
            start = line + 1;
            break
          }
        }
        doc.highlightFrontier = Math.min(doc.highlightFrontier, start);
      }

      // LINE DATA STRUCTURE

      // Line objects. These hold state related to a line, including
      // highlighting info (the styles array).
      var Line = function(text, markedSpans, estimateHeight) {
        this.text = text;
        attachMarkedSpans(this, markedSpans);
        this.height = estimateHeight ? estimateHeight(this) : 1;
      };

      Line.prototype.lineNo = function() {
        return lineNo(this)
      };
      eventMixin(Line);

      // Change the content (text, markers) of a line. Automatically
      // invalidates cached information and tries to re-estimate the
      // line's height.
      function updateLine(line, text, markedSpans, estimateHeight) {
        line.text = text;
        if (line.stateAfter) {
          line.stateAfter = null;
        }
        if (line.styles) {
          line.styles = null;
        }
        if (line.order != null) {
          line.order = null;
        }
        detachMarkedSpans(line);
        attachMarkedSpans(line, markedSpans);
        var estHeight = estimateHeight ? estimateHeight(line) : 1;
        if (estHeight != line.height) {
          updateLineHeight(line, estHeight);
        }
      }

      // Detach a line from the document tree and its markers.
      function cleanUpLine(line) {
        line.parent = null;
        detachMarkedSpans(line);
      }

      // Convert a style as returned by a mode (either null, or a string
      // containing one or more styles) to a CSS style. This is cached,
      // and also looks for line-wide styles.
      var styleToClassCache = {};
      var styleToClassCacheWithMode = {};

      function interpretTokenStyle(style, options) {
        if (!style || /^\s*$/.test(style)) {
          return null
        }
        var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
        return cache[style] ||
          (cache[style] = style.replace(/\S+/g, "cm-$&"))
      }

      // Render the DOM representation of the text of a line. Also builds
      // up a 'line map', which points at the DOM nodes that represent
      // specific stretches of text, and is used by the measuring code.
      // The returned object contains the DOM node, this map, and
      // information about line-wide styles that were set by the mode.
      function buildLineContent(cm, lineView) {
        // The padding-right forces the element to have a 'border', which
        // is needed on Webkit to be able to get line-level bounding
        // rectangles for it (in measureChar).
        var content = eltP("span", null, null, webkit ? "padding-right: .1px" : null);
        var builder = {
          pre: eltP("pre", [content], "CodeMirror-line"),
          content: content,
          col: 0,
          pos: 0,
          cm: cm,
          trailingSpace: false,
          splitSpaces: (ie || webkit) && cm.getOption("lineWrapping")
        };
        lineView.measure = {};

        // Iterate over the logical lines that make up this visual line.
        for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
          var line = i ? lineView.rest[i - 1] : lineView.line,
            order = (void 0);
          builder.pos = 0;
          builder.addToken = buildToken;
          // Optionally wire in some hacks into the token-rendering
          // algorithm, to deal with browser quirks.
          if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction))) {
            builder.addToken = buildTokenBadBidi(builder.addToken, order);
          }
          builder.map = [];
          var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
          insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
          if (line.styleClasses) {
            if (line.styleClasses.bgClass) {
              builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || "");
            }
            if (line.styleClasses.textClass) {
              builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || "");
            }
          }

          // Ensure at least a single node is present, for measuring.
          if (builder.map.length == 0) {
            builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure)));
          }

          // Store the map and a cache object for the current logical line
          if (i == 0) {
            lineView.measure.map = builder.map;
            lineView.measure.cache = {};
          } else {
            (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map);
            (lineView.measure.caches || (lineView.measure.caches = [])).push({});
          }
        }

        // See issue #2901
        if (webkit) {
          var last = builder.content.lastChild;
          if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab"))) {
            builder.content.className = "cm-tab-wrap-hack";
          }
        }

        signal(cm, "renderLine", cm, lineView.line, builder.pre);
        if (builder.pre.className) {
          builder.textClass = joinClasses(builder.pre.className, builder.textClass || "");
        }

        return builder
      }

      function defaultSpecialCharPlaceholder(ch) {
        var token = elt("span", "\u2022", "cm-invalidchar");
        token.title = "\\u" + ch.charCodeAt(0).toString(16);
        token.setAttribute("aria-label", token.title);
        return token
      }

      // Build up the DOM representation for a single token, and add it to
      // the line map. Takes care to render special characters separately.
      function buildToken(builder, text, style, startStyle, endStyle, title, css) {
        if (!text) {
          return
        }
        var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text;
        var special = builder.cm.state.specialChars,
          mustWrap = false;
        var content;
        if (!special.test(text)) {
          builder.col += text.length;
          content = document.createTextNode(displayText);
          builder.map.push(builder.pos, builder.pos + text.length, content);
          if (ie && ie_version < 9) {
            mustWrap = true;
          }
          builder.pos += text.length;
        } else {
          content = document.createDocumentFragment();
          var pos = 0;
          while (true) {
            special.lastIndex = pos;
            var m = special.exec(text);
            var skipped = m ? m.index - pos : text.length - pos;
            if (skipped) {
              var txt = document.createTextNode(displayText.slice(pos, pos + skipped));
              if (ie && ie_version < 9) {
                content.appendChild(elt("span", [txt]));
              } else {
                content.appendChild(txt);
              }
              builder.map.push(builder.pos, builder.pos + skipped, txt);
              builder.col += skipped;
              builder.pos += skipped;
            }
            if (!m) {
              break
            }
            pos += skipped + 1;
            var txt$1 = (void 0);
            if (m[0] == "\t") {
              var tabSize = builder.cm.options.tabSize,
                tabWidth = tabSize - builder.col % tabSize;
              txt$1 = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
              txt$1.setAttribute("role", "presentation");
              txt$1.setAttribute("cm-text", "\t");
              builder.col += tabWidth;
            } else if (m[0] == "\r" || m[0] == "\n") {
              txt$1 = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"));
              txt$1.setAttribute("cm-text", m[0]);
              builder.col += 1;
            } else {
              txt$1 = builder.cm.options.specialCharPlaceholder(m[0]);
              txt$1.setAttribute("cm-text", m[0]);
              if (ie && ie_version < 9) {
                content.appendChild(elt("span", [txt$1]));
              } else {
                content.appendChild(txt$1);
              }
              builder.col += 1;
            }
            builder.map.push(builder.pos, builder.pos + 1, txt$1);
            builder.pos++;
          }
        }
        builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32;
        if (style || startStyle || endStyle || mustWrap || css) {
          var fullStyle = style || "";
          if (startStyle) {
            fullStyle += startStyle;
          }
          if (endStyle) {
            fullStyle += endStyle;
          }
          var token = elt("span", [content], fullStyle, css);
          if (title) {
            token.title = title;
          }
          return builder.content.appendChild(token)
        }
        builder.content.appendChild(content);
      }

      function splitSpaces(text, trailingBefore) {
        if (text.length > 1 && !/  /.test(text)) {
          return text
        }
        var spaceBefore = trailingBefore,
          result = "";
        for (var i = 0; i < text.length; i++) {
          var ch = text.charAt(i);
          if (ch == " " && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32)) {
            ch = "\u00a0";
          }
          result += ch;
          spaceBefore = ch == " ";
        }
        return result
      }

      // Work around nonsense dimensions being reported for stretches of
      // right-to-left text.
      function buildTokenBadBidi(inner, order) {
        return function(builder, text, style, startStyle, endStyle, title, css) {
          style = style ? style + " cm-force-border" : "cm-force-border";
          var start = builder.pos,
            end = start + text.length;
          for (;;) {
            // Find the part that overlaps with the start of this text
            var part = (void 0);
            for (var i = 0; i < order.length; i++) {
              part = order[i];
              if (part.to > start && part.from <= start) {
                break
              }
            }
            if (part.to >= end) {
              return inner(builder, text, style, startStyle, endStyle, title, css)
            }
            inner(builder, text.slice(0, part.to - start), style, startStyle, null, title, css);
            startStyle = null;
            text = text.slice(part.to - start);
            start = part.to;
          }
        }
      }

      function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
        var widget = !ignoreWidget && marker.widgetNode;
        if (widget) {
          builder.map.push(builder.pos, builder.pos + size, widget);
        }
        if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
          if (!widget) {
            widget = builder.content.appendChild(document.createElement("span"));
          }
          widget.setAttribute("cm-marker", marker.id);
        }
        if (widget) {
          builder.cm.display.input.setUneditable(widget);
          builder.content.appendChild(widget);
        }
        builder.pos += size;
        builder.trailingSpace = false;
      }

      // Outputs a number of spans to make up a line, taking highlighting
      // and marked text into account.
      function insertLineContent(line, builder, styles) {
        var spans = line.markedSpans,
          allText = line.text,
          at = 0;
        if (!spans) {
          for (var i$1 = 1; i$1 < styles.length; i$1 += 2) {
            builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1 + 1], builder.cm.options));
          }
          return
        }

        var len = allText.length,
          pos = 0,
          i = 1,
          text = "",
          style, css;
        var nextChange = 0,
          spanStyle, spanEndStyle, spanStartStyle, title, collapsed;
        for (;;) {
          if (nextChange == pos) { // Update current marker set
            spanStyle = spanEndStyle = spanStartStyle = title = css = "";
            collapsed = null;
            nextChange = Infinity;
            var foundBookmarks = [],
              endStyles = (void 0);
            for (var j = 0; j < spans.length; ++j) {
              var sp = spans[j],
                m = sp.marker;
              if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
                foundBookmarks.push(m);
              } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
                if (sp.to != null && sp.to != pos && nextChange > sp.to) {
                  nextChange = sp.to;
                  spanEndStyle = "";
                }
                if (m.className) {
                  spanStyle += " " + m.className;
                }
                if (m.css) {
                  css = (css ? css + ";" : "") + m.css;
                }
                if (m.startStyle && sp.from == pos) {
                  spanStartStyle += " " + m.startStyle;
                }
                if (m.endStyle && sp.to == nextChange) {
                  (endStyles || (endStyles = [])).push(m.endStyle, sp.to);
                }
                if (m.title && !title) {
                  title = m.title;
                }
                if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0)) {
                  collapsed = sp;
                }
              } else if (sp.from > pos && nextChange > sp.from) {
                nextChange = sp.from;
              }
            }
            if (endStyles) {
              for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2) {
                if (endStyles[j$1 + 1] == nextChange) {
                  spanEndStyle += " " + endStyles[j$1];
                }
              }
            }

            if (!collapsed || collapsed.from == pos) {
              for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2) {
                buildCollapsedSpan(builder, 0, foundBookmarks[j$2]);
              }
            }
            if (collapsed && (collapsed.from || 0) == pos) {
              buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
                collapsed.marker, collapsed.from == null);
              if (collapsed.to == null) {
                return
              }
              if (collapsed.to == pos) {
                collapsed = false;
              }
            }
          }
          if (pos >= len) {
            break
          }

          var upto = Math.min(len, nextChange);
          while (true) {
            if (text) {
              var end = pos + text.length;
              if (!collapsed) {
                var tokenText = end > upto ? text.slice(0, upto - pos) : text;
                builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
                  spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title, css);
              }
              if (end >= upto) {
                text = text.slice(upto - pos);
                pos = upto;
                break
              }
              pos = end;
              spanStartStyle = "";
            }
            text = allText.slice(at, at = styles[i++]);
            style = interpretTokenStyle(styles[i++], builder.cm.options);
          }
        }
      }


      // These objects are used to represent the visible (currently drawn)
      // part of the document. A LineView may correspond to multiple
      // logical lines, if those are connected by collapsed ranges.
      function LineView(doc, line, lineN) {
        // The starting line
        this.line = line;
        // Continuing lines, if any
        this.rest = visualLineContinued(line);
        // Number of logical lines in this visual line
        this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
        this.node = this.text = null;
        this.hidden = lineIsHidden(doc, line);
      }

      // Create a range of LineView objects for the given lines.
      function buildViewArray(cm, from, to) {
        var array = [],
          nextPos;
        for (var pos = from; pos < to; pos = nextPos) {
          var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
          nextPos = pos + view.size;
          array.push(view);
        }
        return array
      }

      var operationGroup = null;

      function pushOperation(op) {
        if (operationGroup) {
          operationGroup.ops.push(op);
        } else {
          op.ownsGroup = operationGroup = {
            ops: [op],
            delayedCallbacks: []
          };
        }
      }

      function fireCallbacksForOps(group) {
        // Calls delayed callbacks and cursorActivity handlers until no
        // new ones appear
        var callbacks = group.delayedCallbacks,
          i = 0;
        do {
          for (; i < callbacks.length; i++) {
            callbacks[i].call(null);
          }
          for (var j = 0; j < group.ops.length; j++) {
            var op = group.ops[j];
            if (op.cursorActivityHandlers) {
              while (op.cursorActivityCalled < op.cursorActivityHandlers.length) {
                op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm);
              }
            }
          }
        } while (i < callbacks.length)
      }

      function finishOperation(op, endCb) {
        var group = op.ownsGroup;
        if (!group) {
          return
        }

        try {
          fireCallbacksForOps(group);
        } finally {
          operationGroup = null;
          endCb(group);
        }
      }

      var orphanDelayedCallbacks = null;

      // Often, we want to signal events at a point where we are in the
      // middle of some work, but don't want the handler to start calling
      // other methods on the editor, which might be in an inconsistent
      // state or simply not expect any other events to happen.
      // signalLater looks whether there are any handlers, and schedules
      // them to be executed when the last operation ends, or, if no
      // operation is active, when a timeout fires.
      function signalLater(emitter, type /*, values...*/ ) {
        var arr = getHandlers(emitter, type);
        if (!arr.length) {
          return
        }
        var args = Array.prototype.slice.call(arguments, 2),
          list;
        if (operationGroup) {
          list = operationGroup.delayedCallbacks;
        } else if (orphanDelayedCallbacks) {
          list = orphanDelayedCallbacks;
        } else {
          list = orphanDelayedCallbacks = [];
          setTimeout(fireOrphanDelayed, 0);
        }
        var loop = function(i) {
          list.push(function() {
            return arr[i].apply(null, args);
          });
        };

        for (var i = 0; i < arr.length; ++i)
          loop(i);
      }

      function fireOrphanDelayed() {
        var delayed = orphanDelayedCallbacks;
        orphanDelayedCallbacks = null;
        for (var i = 0; i < delayed.length; ++i) {
          delayed[i]();
        }
      }

      // When an aspect of a line changes, a string is added to
      // lineView.changes. This updates the relevant part of the line's
      // DOM structure.
      function updateLineForChanges(cm, lineView, lineN, dims) {
        for (var j = 0; j < lineView.changes.length; j++) {
          var type = lineView.changes[j];
          if (type == "text") {
            updateLineText(cm, lineView);
          } else if (type == "gutter") {
            updateLineGutter(cm, lineView, lineN, dims);
          } else if (type == "class") {
            updateLineClasses(cm, lineView);
          } else if (type == "widget") {
            updateLineWidgets(cm, lineView, dims);
          }
        }
        lineView.changes = null;
      }

      // Lines with gutter elements, widgets or a background class need to
      // be wrapped, and have the extra elements added to the wrapper div
      function ensureLineWrapped(lineView) {
        if (lineView.node == lineView.text) {
          lineView.node = elt("div", null, null, "position: relative");
          if (lineView.text.parentNode) {
            lineView.text.parentNode.replaceChild(lineView.node, lineView.text);
          }
          lineView.node.appendChild(lineView.text);
          if (ie && ie_version < 8) {
            lineView.node.style.zIndex = 2;
          }
        }
        return lineView.node
      }

      function updateLineBackground(cm, lineView) {
        var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass;
        if (cls) {
          cls += " CodeMirror-linebackground";
        }
        if (lineView.background) {
          if (cls) {
            lineView.background.className = cls;
          } else {
            lineView.background.parentNode.removeChild(lineView.background);
            lineView.background = null;
          }
        } else if (cls) {
          var wrap = ensureLineWrapped(lineView);
          lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
          cm.display.input.setUneditable(lineView.background);
        }
      }

      // Wrapper around buildLineContent which will reuse the structure
      // in display.externalMeasured when possible.
      function getLineContent(cm, lineView) {
        var ext = cm.display.externalMeasured;
        if (ext && ext.line == lineView.line) {
          cm.display.externalMeasured = null;
          lineView.measure = ext.measure;
          return ext.built
        }
        return buildLineContent(cm, lineView)
      }

      // Redraw the line's text. Interacts with the background and text
      // classes because the mode may output tokens that influence these
      // classes.
      function updateLineText(cm, lineView) {
        var cls = lineView.text.className;
        var built = getLineContent(cm, lineView);
        if (lineView.text == lineView.node) {
          lineView.node = built.pre;
        }
        lineView.text.parentNode.replaceChild(built.pre, lineView.text);
        lineView.text = built.pre;
        if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
          lineView.bgClass = built.bgClass;
          lineView.textClass = built.textClass;
          updateLineClasses(cm, lineView);
        } else if (cls) {
          lineView.text.className = cls;
        }
      }

      function updateLineClasses(cm, lineView) {
        updateLineBackground(cm, lineView);
        if (lineView.line.wrapClass) {
          ensureLineWrapped(lineView).className = lineView.line.wrapClass;
        } else if (lineView.node != lineView.text) {
          lineView.node.className = "";
        }
        var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass;
        lineView.text.className = textClass || "";
      }

      function updateLineGutter(cm, lineView, lineN, dims) {
        if (lineView.gutter) {
          lineView.node.removeChild(lineView.gutter);
          lineView.gutter = null;
        }
        if (lineView.gutterBackground) {
          lineView.node.removeChild(lineView.gutterBackground);
          lineView.gutterBackground = null;
        }
        if (lineView.line.gutterClass) {
          var wrap = ensureLineWrapped(lineView);
          lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
            ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px; width: " + (dims.gutterTotalWidth) + "px"));
          cm.display.input.setUneditable(lineView.gutterBackground);
          wrap.insertBefore(lineView.gutterBackground, lineView.text);
        }
        var markers = lineView.line.gutterMarkers;
        if (cm.options.lineNumbers || markers) {
          var wrap$1 = ensureLineWrapped(lineView);
          var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"));
          cm.display.input.setUneditable(gutterWrap);
          wrap$1.insertBefore(gutterWrap, lineView.text);
          if (lineView.line.gutterClass) {
            gutterWrap.className += " " + lineView.line.gutterClass;
          }
          if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"])) {
            lineView.lineNumber = gutterWrap.appendChild(
              elt("div", lineNumberFor(cm.options, lineN),
                "CodeMirror-linenumber CodeMirror-gutter-elt",
                ("left: " + (dims.gutterLeft["CodeMirror-linenumbers"]) + "px; width: " + (cm.display.lineNumInnerWidth) + "px")));
          }
          if (markers) {
            for (var k = 0; k < cm.options.gutters.length; ++k) {
              var id = cm.options.gutters[k],
                found = markers.hasOwnProperty(id) && markers[id];
              if (found) {
                gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt",
                  ("left: " + (dims.gutterLeft[id]) + "px; width: " + (dims.gutterWidth[id]) + "px")));
              }
            }
          }
        }
      }

      function updateLineWidgets(cm, lineView, dims) {
        if (lineView.alignable) {
          lineView.alignable = null;
        }
        for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {
          next = node.nextSibling;
          if (node.className == "CodeMirror-linewidget") {
            lineView.node.removeChild(node);
          }
        }
        insertLineWidgets(cm, lineView, dims);
      }

      // Build a line's DOM representation from scratch
      function buildLineElement(cm, lineView, lineN, dims) {
        var built = getLineContent(cm, lineView);
        lineView.text = lineView.node = built.pre;
        if (built.bgClass) {
          lineView.bgClass = built.bgClass;
        }
        if (built.textClass) {
          lineView.textClass = built.textClass;
        }

        updateLineClasses(cm, lineView);
        updateLineGutter(cm, lineView, lineN, dims);
        insertLineWidgets(cm, lineView, dims);
        return lineView.node
      }

      // A lineView may contain multiple logical lines (when merged by
      // collapsed spans). The widgets for all of them need to be drawn.
      function insertLineWidgets(cm, lineView, dims) {
        insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
        if (lineView.rest) {
          for (var i = 0; i < lineView.rest.length; i++) {
            insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false);
          }
        }
      }

      function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
        if (!line.widgets) {
          return
        }
        var wrap = ensureLineWrapped(lineView);
        for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
          var widget = ws[i],
            node = elt("div", [widget.node], "CodeMirror-linewidget");
          if (!widget.handleMouseEvents) {
            node.setAttribute("cm-ignore-events", "true");
          }
          positionLineWidget(widget, node, lineView, dims);
          cm.display.input.setUneditable(node);
          if (allowAbove && widget.above) {
            wrap.insertBefore(node, lineView.gutter || lineView.text);
          } else {
            wrap.appendChild(node);
          }
          signalLater(widget, "redraw");
        }
      }

      function positionLineWidget(widget, node, lineView, dims) {
        if (widget.noHScroll) {
          (lineView.alignable || (lineView.alignable = [])).push(node);
          var width = dims.wrapperWidth;
          node.style.left = dims.fixedPos + "px";
          if (!widget.coverGutter) {
            width -= dims.gutterTotalWidth;
            node.style.paddingLeft = dims.gutterTotalWidth + "px";
          }
          node.style.width = width + "px";
        }
        if (widget.coverGutter) {
          node.style.zIndex = 5;
          node.style.position = "relative";
          if (!widget.noHScroll) {
            node.style.marginLeft = -dims.gutterTotalWidth + "px";
          }
        }
      }

      function widgetHeight(widget) {
        if (widget.height != null) {
          return widget.height
        }
        var cm = widget.doc.cm;
        if (!cm) {
          return 0
        }
        if (!contains(document.body, widget.node)) {
          var parentStyle = "position: relative;";
          if (widget.coverGutter) {
            parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;";
          }
          if (widget.noHScroll) {
            parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;";
          }
          removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle));
        }
        return widget.height = widget.node.parentNode.offsetHeight
      }

      // Return true when the given mouse event happened in a widget
      function eventInWidget(display, e) {
        for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
          if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
            (n.parentNode == display.sizer && n != display.mover)) {
            return true
          }
        }
      }

      // POSITION MEASUREMENT

      function paddingTop(display) {
        return display.lineSpace.offsetTop
      }

      function paddingVert(display) {
        return display.mover.offsetHeight - display.lineSpace.offsetHeight
      }

      function paddingH(display) {
        if (display.cachedPaddingH) {
          return display.cachedPaddingH
        }
        var e = removeChildrenAndAdd(display.measure, elt("pre", "x"));
        var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;
        var data = {
          left: parseInt(style.paddingLeft),
          right: parseInt(style.paddingRight)
        };
        if (!isNaN(data.left) && !isNaN(data.right)) {
          display.cachedPaddingH = data;
        }
        return data
      }

      function scrollGap(cm) {
        return scrollerGap - cm.display.nativeBarWidth
      }

      function displayWidth(cm) {
        return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
      }

      function displayHeight(cm) {
        return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
      }

      // Ensure the lineView.wrapping.heights array is populated. This is
      // an array of bottom offsets for the lines that make up a drawn
      // line. When lineWrapping is on, there might be more than one
      // height.
      function ensureLineHeights(cm, lineView, rect) {
        var wrapping = cm.options.lineWrapping;
        var curWidth = wrapping && displayWidth(cm);
        if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
          var heights = lineView.measure.heights = [];
          if (wrapping) {
            lineView.measure.width = curWidth;
            var rects = lineView.text.firstChild.getClientRects();
            for (var i = 0; i < rects.length - 1; i++) {
              var cur = rects[i],
                next = rects[i + 1];
              if (Math.abs(cur.bottom - next.bottom) > 2) {
                heights.push((cur.bottom + next.top) / 2 - rect.top);
              }
            }
          }
          heights.push(rect.bottom - rect.top);
        }
      }

      // Find a line map (mapping character offsets to text nodes) and a
      // measurement cache for the given line number. (A line view might
      // contain multiple lines when collapsed ranges are present.)
      function mapFromLineView(lineView, line, lineN) {
        if (lineView.line == line) {
          return {
            map: lineView.measure.map,
            cache: lineView.measure.cache
          }
        }
        for (var i = 0; i < lineView.rest.length; i++) {
          if (lineView.rest[i] == line) {
            return {
              map: lineView.measure.maps[i],
              cache: lineView.measure.caches[i]
            }
          }
        }
        for (var i$1 = 0; i$1 < lineView.rest.length; i$1++) {
          if (lineNo(lineView.rest[i$1]) > lineN) {
            return {
              map: lineView.measure.maps[i$1],
              cache: lineView.measure.caches[i$1],
              before: true
            }
          }
        }
      }

      // Render a line into the hidden node display.externalMeasured. Used
      // when measurement is needed for a line that's not in the viewport.
      function updateExternalMeasurement(cm, line) {
        line = visualLine(line);
        var lineN = lineNo(line);
        var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
        view.lineN = lineN;
        var built = view.built = buildLineContent(cm, view);
        view.text = built.pre;
        removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
        return view
      }

      // Get a {top, bottom, left, right} box (in line-local coordinates)
      // for a given character.
      function measureChar(cm, line, ch, bias) {
        return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)
      }

      // Find a line view that corresponds to the given line number.
      function findViewForLine(cm, lineN) {
        if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo) {
          return cm.display.view[findViewIndex(cm, lineN)]
        }
        var ext = cm.display.externalMeasured;
        if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size) {
          return ext
        }
      }

      // Measurement can be split in two steps, the set-up work that
      // applies to the whole line, and the measurement of the actual
      // character. Functions like coordsChar, that need to do a lot of
      // measurements in a row, can thus ensure that the set-up work is
      // only done once.
      function prepareMeasureForLine(cm, line) {
        var lineN = lineNo(line);
        var view = findViewForLine(cm, lineN);
        if (view && !view.text) {
          view = null;
        } else if (view && view.changes) {
          updateLineForChanges(cm, view, lineN, getDimensions(cm));
          cm.curOp.forceUpdate = true;
        }
        if (!view) {
          view = updateExternalMeasurement(cm, line);
        }

        var info = mapFromLineView(view, line, lineN);
        return {
          line: line,
          view: view,
          rect: null,
          map: info.map,
          cache: info.cache,
          before: info.before,
          hasHeights: false
        }
      }

      // Given a prepared measurement object, measures the position of an
      // actual character (or fetches it from the cache).
      function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
        if (prepared.before) {
          ch = -1;
        }
        var key = ch + (bias || ""),
          found;
        if (prepared.cache.hasOwnProperty(key)) {
          found = prepared.cache[key];
        } else {
          if (!prepared.rect) {
            prepared.rect = prepared.view.text.getBoundingClientRect();
          }
          if (!prepared.hasHeights) {
            ensureLineHeights(cm, prepared.view, prepared.rect);
            prepared.hasHeights = true;
          }
          found = measureCharInner(cm, prepared, ch, bias);
          if (!found.bogus) {
            prepared.cache[key] = found;
          }
        }
        return {
          left: found.left,
          right: found.right,
          top: varHeight ? found.rtop : found.top,
          bottom: varHeight ? found.rbottom : found.bottom
        }
      }

      var nullRect = {
        left: 0,
        right: 0,
        top: 0,
        bottom: 0
      };

      function nodeAndOffsetInLineMap(map$$1, ch, bias) {
        var node, start, end, collapse, mStart, mEnd;
        // First, search the line map for the text node corresponding to,
        // or closest to, the target character.
        for (var i = 0; i < map$$1.length; i += 3) {
          mStart = map$$1[i];
          mEnd = map$$1[i + 1];
          if (ch < mStart) {
            start = 0;
            end = 1;
            collapse = "left";
          } else if (ch < mEnd) {
            start = ch - mStart;
            end = start + 1;
          } else if (i == map$$1.length - 3 || ch == mEnd && map$$1[i + 3] > ch) {
            end = mEnd - mStart;
            start = end - 1;
            if (ch >= mEnd) {
              collapse = "right";
            }
          }
          if (start != null) {
            node = map$$1[i + 2];
            if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right")) {
              collapse = bias;
            }
            if (bias == "left" && start == 0) {
              while (i && map$$1[i - 2] == map$$1[i - 3] && map$$1[i - 1].insertLeft) {
                node = map$$1[(i -= 3) + 2];
                collapse = "left";
              }
            }
            if (bias == "right" && start == mEnd - mStart) {
              while (i < map$$1.length - 3 && map$$1[i + 3] == map$$1[i + 4] && !map$$1[i + 5].insertLeft) {
                node = map$$1[(i += 3) + 2];
                collapse = "right";
              }
            }
            break
          }
        }
        return {
          node: node,
          start: start,
          end: end,
          collapse: collapse,
          coverStart: mStart,
          coverEnd: mEnd
        }
      }

      function getUsefulRect(rects, bias) {
        var rect = nullRect;
        if (bias == "left") {
          for (var i = 0; i < rects.length; i++) {
            if ((rect = rects[i]).left != rect.right) {
              break
            }
          }
        } else {
          for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {
            if ((rect = rects[i$1]).left != rect.right) {
              break
            }
          }
        }
        return rect
      }

      function measureCharInner(cm, prepared, ch, bias) {
        var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
        var node = place.node,
          start = place.start,
          end = place.end,
          collapse = place.collapse;

        var rect;
        if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
          for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned
            while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) {
              --start;
            }
            while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) {
              ++end;
            }
            if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart) {
              rect = node.parentNode.getBoundingClientRect();
            } else {
              rect = getUsefulRect(range(node, start, end).getClientRects(), bias);
            }
            if (rect.left || rect.right || start == 0) {
              break
            }
            end = start;
            start = start - 1;
            collapse = "right";
          }
          if (ie && ie_version < 11) {
            rect = maybeUpdateRectForZooming(cm.display.measure, rect);
          }
        } else { // If it is a widget, simply get the box for the whole widget.
          if (start > 0) {
            collapse = bias = "right";
          }
          var rects;
          if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1) {
            rect = rects[bias == "right" ? rects.length - 1 : 0];
          } else {
            rect = node.getBoundingClientRect();
          }
        }
        if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
          var rSpan = node.parentNode.getClientRects()[0];
          if (rSpan) {
            rect = {
              left: rSpan.left,
              right: rSpan.left + charWidth(cm.display),
              top: rSpan.top,
              bottom: rSpan.bottom
            };
          } else {
            rect = nullRect;
          }
        }

        var rtop = rect.top - prepared.rect.top,
          rbot = rect.bottom - prepared.rect.top;
        var mid = (rtop + rbot) / 2;
        var heights = prepared.view.measure.heights;
        var i = 0;
        for (; i < heights.length - 1; i++) {
          if (mid < heights[i]) {
            break
          }
        }
        var top = i ? heights[i - 1] : 0,
          bot = heights[i];
        var result = {
          left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
          right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
          top: top,
          bottom: bot
        };
        if (!rect.left && !rect.right) {
          result.bogus = true;
        }
        if (!cm.options.singleCursorHeightPerLine) {
          result.rtop = rtop;
          result.rbottom = rbot;
        }

        return result
      }

      // Work around problem with bounding client rects on ranges being
      // returned incorrectly when zoomed on IE10 and below.
      function maybeUpdateRectForZooming(measure, rect) {
        if (!window.screen || screen.logicalXDPI == null ||
          screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure)) {
          return rect
        }
        var scaleX = screen.logicalXDPI / screen.deviceXDPI;
        var scaleY = screen.logicalYDPI / screen.deviceYDPI;
        return {
          left: rect.left * scaleX,
          right: rect.right * scaleX,
          top: rect.top * scaleY,
          bottom: rect.bottom * scaleY
        }
      }

      function clearLineMeasurementCacheFor(lineView) {
        if (lineView.measure) {
          lineView.measure.cache = {};
          lineView.measure.heights = null;
          if (lineView.rest) {
            for (var i = 0; i < lineView.rest.length; i++) {
              lineView.measure.caches[i] = {};
            }
          }
        }
      }

      function clearLineMeasurementCache(cm) {
        cm.display.externalMeasure = null;
        removeChildren(cm.display.lineMeasure);
        for (var i = 0; i < cm.display.view.length; i++) {
          clearLineMeasurementCacheFor(cm.display.view[i]);
        }
      }

      function clearCaches(cm) {
        clearLineMeasurementCache(cm);
        cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;
        if (!cm.options.lineWrapping) {
          cm.display.maxLineChanged = true;
        }
        cm.display.lineNumChars = null;
      }

      function pageScrollX() {
        // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
        // which causes page_Offset and bounding client rects to use
        // different reference viewports and invalidate our calculations.
        if (chrome && android) {
          return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft))
        }
        return window.pageXOffset || (document.documentElement || document.body).scrollLeft
      }

      function pageScrollY() {
        if (chrome && android) {
          return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop))
        }
        return window.pageYOffset || (document.documentElement || document.body).scrollTop
      }

      function widgetTopHeight(lineObj) {
        var height = 0;
        if (lineObj.widgets) {
          for (var i = 0; i < lineObj.widgets.length; ++i) {
            if (lineObj.widgets[i].above) {
              height += widgetHeight(lineObj.widgets[i]);
            }
          }
        }
        return height
      }

      // Converts a {top, bottom, left, right} box from line-local
      // coordinates into another coordinate system. Context may be one of
      // "line", "div" (display.lineDiv), "local"./null (editor), "window",
      // or "page".
      function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
        if (!includeWidgets) {
          var height = widgetTopHeight(lineObj);
          rect.top += height;
          rect.bottom += height;
        }
        if (context == "line") {
          return rect
        }
        if (!context) {
          context = "local";
        }
        var yOff = heightAtLine(lineObj);
        if (context == "local") {
          yOff += paddingTop(cm.display);
        } else {
          yOff -= cm.display.viewOffset;
        }
        if (context == "page" || context == "window") {
          var lOff = cm.display.lineSpace.getBoundingClientRect();
          yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
          var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
          rect.left += xOff;
          rect.right += xOff;
        }
        rect.top += yOff;
        rect.bottom += yOff;
        return rect
      }

      // Coverts a box from "div" coords to another coordinate system.
      // Context may be "window", "page", "div", or "local"./null.
      function fromCoordSystem(cm, coords, context) {
        if (context == "div") {
          return coords
        }
        var left = coords.left,
          top = coords.top;
        // First move into "page" coordinate system
        if (context == "page") {
          left -= pageScrollX();
          top -= pageScrollY();
        } else if (context == "local" || !context) {
          var localBox = cm.display.sizer.getBoundingClientRect();
          left += localBox.left;
          top += localBox.top;
        }

        var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
        return {
          left: left - lineSpaceBox.left,
          top: top - lineSpaceBox.top
        }
      }

      function charCoords(cm, pos, context, lineObj, bias) {
        if (!lineObj) {
          lineObj = getLine(cm.doc, pos.line);
        }
        return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)
      }

      // Returns a box for a given cursor position, which may have an
      // 'other' property containing the position of the secondary cursor
      // on a bidi boundary.
      // A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
      // and after `char - 1` in writing order of `char - 1`
      // A cursor Pos(line, char, "after") is on the same visual line as `char`
      // and before `char` in writing order of `char`
      // Examples (upper-case letters are RTL, lower-case are LTR):
      //     Pos(0, 1, ...)
      //     before   after
      // ab     a|b     a|b
      // aB     a|B     aB|
      // Ab     |Ab     A|b
      // AB     B|A     B|A
      // Every position after the last character on a line is considered to stick
      // to the last character on the line.
      function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
        lineObj = lineObj || getLine(cm.doc, pos.line);
        if (!preparedMeasure) {
          preparedMeasure = prepareMeasureForLine(cm, lineObj);
        }

        function get(ch, right) {
          var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight);
          if (right) {
            m.left = m.right;
          } else {
            m.right = m.left;
          }
          return intoCoordSystem(cm, lineObj, m, context)
        }
        var order = getOrder(lineObj, cm.doc.direction),
          ch = pos.ch,
          sticky = pos.sticky;
        if (ch >= lineObj.text.length) {
          ch = lineObj.text.length;
          sticky = "before";
        } else if (ch <= 0) {
          ch = 0;
          sticky = "after";
        }
        if (!order) {
          return get(sticky == "before" ? ch - 1 : ch, sticky == "before")
        }

        function getBidi(ch, partPos, invert) {
          var part = order[partPos],
            right = part.level == 1;
          return get(invert ? ch - 1 : ch, right != invert)
        }
        var partPos = getBidiPartAt(order, ch, sticky);
        var other = bidiOther;
        var val = getBidi(ch, partPos, sticky == "before");
        if (other != null) {
          val.other = getBidi(ch, other, sticky != "before");
        }
        return val
      }

      // Used to cheaply estimate the coordinates for a position. Used for
      // intermediate scroll updates.
      function estimateCoords(cm, pos) {
        var left = 0;
        pos = clipPos(cm.doc, pos);
        if (!cm.options.lineWrapping) {
          left = charWidth(cm.display) * pos.ch;
        }
        var lineObj = getLine(cm.doc, pos.line);
        var top = heightAtLine(lineObj) + paddingTop(cm.display);
        return {
          left: left,
          right: left,
          top: top,
          bottom: top + lineObj.height
        }
      }

      // Positions returned by coordsChar contain some extra information.
      // xRel is the relative x position of the input coordinates compared
      // to the found position (so xRel > 0 means the coordinates are to
      // the right of the character position, for example). When outside
      // is true, that means the coordinates lie outside the line's
      // vertical range.
      function PosWithInfo(line, ch, sticky, outside, xRel) {
        var pos = Pos(line, ch, sticky);
        pos.xRel = xRel;
        if (outside) {
          pos.outside = true;
        }
        return pos
      }

      // Compute the character position closest to the given coordinates.
      // Input must be lineSpace-local ("div" coordinate system).
      function coordsChar(cm, x, y) {
        var doc = cm.doc;
        y += cm.display.viewOffset;
        if (y < 0) {
          return PosWithInfo(doc.first, 0, null, true, -1)
        }
        var lineN = lineAtHeight(doc, y),
          last = doc.first + doc.size - 1;
        if (lineN > last) {
          return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, true, 1)
        }
        if (x < 0) {
          x = 0;
        }

        var lineObj = getLine(doc, lineN);
        for (;;) {
          var found = coordsCharInner(cm, lineObj, lineN, x, y);
          var merged = collapsedSpanAtEnd(lineObj);
          var mergedPos = merged && merged.find(0, true);
          if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0)) {
            lineN = lineNo(lineObj = mergedPos.to.line);
          } else {
            return found
          }
        }
      }

      function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
        y -= widgetTopHeight(lineObj);
        var end = lineObj.text.length;
        var begin = findFirst(function(ch) {
          return measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y;
        }, end, 0);
        end = findFirst(function(ch) {
          return measureCharPrepared(cm, preparedMeasure, ch).top > y;
        }, begin, end);
        return {
          begin: begin,
          end: end
        }
      }

      function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
        if (!preparedMeasure) {
          preparedMeasure = prepareMeasureForLine(cm, lineObj);
        }
        var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top;
        return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)
      }

      // Returns true if the given side of a box is after the given
      // coordinates, in top-to-bottom, left-to-right order.
      function boxIsAfter(box, x, y, left) {
        return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x
      }

      function coordsCharInner(cm, lineObj, lineNo$$1, x, y) {
        // Move y into line-local coordinate space
        y -= heightAtLine(lineObj);
        var preparedMeasure = prepareMeasureForLine(cm, lineObj);
        // When directly calling `measureCharPrepared`, we have to adjust
        // for the widgets at this line.
        var widgetHeight$$1 = widgetTopHeight(lineObj);
        var begin = 0,
          end = lineObj.text.length,
          ltr = true;

        var order = getOrder(lineObj, cm.doc.direction);
        // If the line isn't plain left-to-right text, first figure out
        // which bidi section the coordinates fall into.
        if (order) {
          var part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)
            (cm, lineObj, lineNo$$1, preparedMeasure, order, x, y);
          ltr = part.level != 1;
          // The awkward -1 offsets are needed because findFirst (called
          // on these below) will treat its first bound as inclusive,
          // second as exclusive, but we want to actually address the
          // characters in the part's range
          begin = ltr ? part.from : part.to - 1;
          end = ltr ? part.to : part.from - 1;
        }

        // A binary search to find the first character whose bounding box
        // starts after the coordinates. If we run across any whose box wrap
        // the coordinates, store that.
        var chAround = null,
          boxAround = null;
        var ch = findFirst(function(ch) {
          var box = measureCharPrepared(cm, preparedMeasure, ch);
          box.top += widgetHeight$$1;
          box.bottom += widgetHeight$$1;
          if (!boxIsAfter(box, x, y, false)) {
            return false
          }
          if (box.top <= y && box.left <= x) {
            chAround = ch;
            boxAround = box;
          }
          return true
        }, begin, end);

        var baseX, sticky, outside = false;
        // If a box around the coordinates was found, use that
        if (boxAround) {
          // Distinguish coordinates nearer to the left or right side of the box
          var atLeft = x - boxAround.left < boxAround.right - x,
            atStart = atLeft == ltr;
          ch = chAround + (atStart ? 0 : 1);
          sticky = atStart ? "after" : "before";
          baseX = atLeft ? boxAround.left : boxAround.right;
        } else {
          // (Adjust for extended bound, if necessary.)
          if (!ltr && (ch == end || ch == begin)) {
            ch++;
          }
          // To determine which side to associate with, get the box to the
          // left of the character and compare it's vertical position to the
          // coordinates
          sticky = ch == 0 ? "after" : ch == lineObj.text.length ? "before" :
            (measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight$$1 <= y) == ltr ?
            "after" : "before";
          // Now get accurate coordinates for this place, in order to get a
          // base X position
          var coords = cursorCoords(cm, Pos(lineNo$$1, ch, sticky), "line", lineObj, preparedMeasure);
          baseX = coords.left;
          outside = y < coords.top || y >= coords.bottom;
        }

        ch = skipExtendingChars(lineObj.text, ch, 1);
        return PosWithInfo(lineNo$$1, ch, sticky, outside, x - baseX)
      }

      function coordsBidiPart(cm, lineObj, lineNo$$1, preparedMeasure, order, x, y) {
        // Bidi parts are sorted left-to-right, and in a non-line-wrapping
        // situation, we can take this ordering to correspond to the visual
        // ordering. This finds the first part whose end is after the given
        // coordinates.
        var index = findFirst(function(i) {
          var part = order[i],
            ltr = part.level != 1;
          return boxIsAfter(cursorCoords(cm, Pos(lineNo$$1, ltr ? part.to : part.from, ltr ? "before" : "after"),
            "line", lineObj, preparedMeasure), x, y, true)
        }, 0, order.length - 1);
        var part = order[index];
        // If this isn't the first part, the part's start is also after
        // the coordinates, and the coordinates aren't on the same line as
        // that start, move one part back.
        if (index > 0) {
          var ltr = part.level != 1;
          var start = cursorCoords(cm, Pos(lineNo$$1, ltr ? part.from : part.to, ltr ? "after" : "before"),
            "line", lineObj, preparedMeasure);
          if (boxIsAfter(start, x, y, true) && start.top > y) {
            part = order[index - 1];
          }
        }
        return part
      }

      function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {
        // In a wrapped line, rtl text on wrapping boundaries can do things
        // that don't correspond to the ordering in our `order` array at
        // all, so a binary search doesn't work, and we want to return a
        // part that only spans one line so that the binary search in
        // coordsCharInner is safe. As such, we first find the extent of the
        // wrapped line, and then do a flat search in which we discard any
        // spans that aren't on the line.
        var ref = wrappedLineExtent(cm, lineObj, preparedMeasure, y);
        var begin = ref.begin;
        var end = ref.end;
        if (/\s/.test(lineObj.text.charAt(end - 1))) {
          end--;
        }
        var part = null,
          closestDist = null;
        for (var i = 0; i < order.length; i++) {
          var p = order[i];
          if (p.from >= end || p.to <= begin) {
            continue
          }
          var ltr = p.level != 1;
          var endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right;
          // Weigh against spans ending before this, so that they are only
          // picked if nothing ends after
          var dist = endX < x ? x - endX + 1e9 : endX - x;
          if (!part || closestDist > dist) {
            part = p;
            closestDist = dist;
          }
        }
        if (!part) {
          part = order[order.length - 1];
        }
        // Clip the part to the wrapped line.
        if (part.from < begin) {
          part = {
            from: begin,
            to: part.to,
            level: part.level
          };
        }
        if (part.to > end) {
          part = {
            from: part.from,
            to: end,
            level: part.level
          };
        }
        return part
      }

      var measureText;
      // Compute the default text height.
      function textHeight(display) {
        if (display.cachedTextHeight != null) {
          return display.cachedTextHeight
        }
        if (measureText == null) {
          measureText = elt("pre");
          // Measure a bunch of lines, for browsers that compute
          // fractional heights.
          for (var i = 0; i < 49; ++i) {
            measureText.appendChild(document.createTextNode("x"));
            measureText.appendChild(elt("br"));
          }
          measureText.appendChild(document.createTextNode("x"));
        }
        removeChildrenAndAdd(display.measure, measureText);
        var height = measureText.offsetHeight / 50;
        if (height > 3) {
          display.cachedTextHeight = height;
        }
        removeChildren(display.measure);
        return height || 1
      }

      // Compute the default character width.
      function charWidth(display) {
        if (display.cachedCharWidth != null) {
          return display.cachedCharWidth
        }
        var anchor = elt("span", "xxxxxxxxxx");
        var pre = elt("pre", [anchor]);
        removeChildrenAndAdd(display.measure, pre);
        var rect = anchor.getBoundingClientRect(),
          width = (rect.right - rect.left) / 10;
        if (width > 2) {
          display.cachedCharWidth = width;
        }
        return width || 10
      }

      // Do a bulk-read of the DOM positions and sizes needed to draw the
      // view, so that we don't interleave reading and writing to the DOM.
      function getDimensions(cm) {
        var d = cm.display,
          left = {},
          width = {};
        var gutterLeft = d.gutters.clientLeft;
        for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
          left[cm.options.gutters[i]] = n.offsetLeft + n.clientLeft + gutterLeft;
          width[cm.options.gutters[i]] = n.clientWidth;
        }
        return {
          fixedPos: compensateForHScroll(d),
          gutterTotalWidth: d.gutters.offsetWidth,
          gutterLeft: left,
          gutterWidth: width,
          wrapperWidth: d.wrapper.clientWidth
        }
      }

      // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
      // but using getBoundingClientRect to get a sub-pixel-accurate
      // result.
      function compensateForHScroll(display) {
        return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left
      }

      // Returns a function that estimates the height of a line, to use as
      // first approximation until the line becomes visible (and is thus
      // properly measurable).
      function estimateHeight(cm) {
        var th = textHeight(cm.display),
          wrapping = cm.options.lineWrapping;
        var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
        return function(line) {
          if (lineIsHidden(cm.doc, line)) {
            return 0
          }

          var widgetsHeight = 0;
          if (line.widgets) {
            for (var i = 0; i < line.widgets.length; i++) {
              if (line.widgets[i].height) {
                widgetsHeight += line.widgets[i].height;
              }
            }
          }

          if (wrapping) {
            return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th
          } else {
            return widgetsHeight + th
          }
        }
      }

      function estimateLineHeights(cm) {
        var doc = cm.doc,
          est = estimateHeight(cm);
        doc.iter(function(line) {
          var estHeight = est(line);
          if (estHeight != line.height) {
            updateLineHeight(line, estHeight);
          }
        });
      }

      // Given a mouse event, find the corresponding position. If liberal
      // is false, it checks whether a gutter or scrollbar was clicked,
      // and returns null if it was. forRect is used by rectangular
      // selections, and tries to estimate a character position even for
      // coordinates beyond the right of the text.
      function posFromMouse(cm, e, liberal, forRect) {
        var display = cm.display;
        if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") {
          return null
        }

        var x, y, space = display.lineSpace.getBoundingClientRect();
        // Fails unpredictably on IE[67] when mouse is dragged around quickly.
        try {
          x = e.clientX - space.left;
          y = e.clientY - space.top;
        } catch (e) {
          return null
        }
        var coords = coordsChar(cm, x, y),
          line;
        if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
          var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
          coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
        }
        return coords
      }

      // Find the view element corresponding to a given line. Return null
      // when the line isn't visible.
      function findViewIndex(cm, n) {
        if (n >= cm.display.viewTo) {
          return null
        }
        n -= cm.display.viewFrom;
        if (n < 0) {
          return null
        }
        var view = cm.display.view;
        for (var i = 0; i < view.length; i++) {
          n -= view[i].size;
          if (n < 0) {
            return i
          }
        }
      }

      function updateSelection(cm) {
        cm.display.input.showSelection(cm.display.input.prepareSelection());
      }

      function prepareSelection(cm, primary) {
        if (primary === void 0) primary = true;

        var doc = cm.doc,
          result = {};
        var curFragment = result.cursors = document.createDocumentFragment();
        var selFragment = result.selection = document.createDocumentFragment();

        for (var i = 0; i < doc.sel.ranges.length; i++) {
          if (!primary && i == doc.sel.primIndex) {
            continue
          }
          var range$$1 = doc.sel.ranges[i];
          if (range$$1.from().line >= cm.display.viewTo || range$$1.to().line < cm.display.viewFrom) {
            continue
          }
          var collapsed = range$$1.empty();
          if (collapsed || cm.options.showCursorWhenSelecting) {
            drawSelectionCursor(cm, range$$1.head, curFragment);
          }
          if (!collapsed) {
            drawSelectionRange(cm, range$$1, selFragment);
          }
        }
        return result
      }

      // Draws a cursor for the given range
      function drawSelectionCursor(cm, head, output) {
        var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine);

        var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
        cursor.style.left = pos.left + "px";
        cursor.style.top = pos.top + "px";
        cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";

        if (pos.other) {
          // Secondary cursor, shown when on a 'jump' in bi-directional text
          var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
          otherCursor.style.display = "";
          otherCursor.style.left = pos.other.left + "px";
          otherCursor.style.top = pos.other.top + "px";
          otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
        }
      }

      function cmpCoords(a, b) {
        return a.top - b.top || a.left - b.left
      }

      // Draws the given range as a highlighted selection
      function drawSelectionRange(cm, range$$1, output) {
        var display = cm.display,
          doc = cm.doc;
        var fragment = document.createDocumentFragment();
        var padding = paddingH(cm.display),
          leftSide = padding.left;
        var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;
        var docLTR = doc.direction == "ltr";

        function add(left, top, width, bottom) {
          if (top < 0) {
            top = 0;
          }
          top = Math.round(top);
          bottom = Math.round(bottom);
          fragment.appendChild(elt("div", null, "CodeMirror-selected", ("position: absolute; left: " + left + "px;\n                             top: " + top + "px; width: " + (width == null ? rightSide - left : width) + "px;\n                             height: " + (bottom - top) + "px")));
        }

        function drawForLine(line, fromArg, toArg) {
          var lineObj = getLine(doc, line);
          var lineLen = lineObj.text.length;
          var start, end;

          function coords(ch, bias) {
            return charCoords(cm, Pos(line, ch), "div", lineObj, bias)
          }

          function wrapX(pos, dir, side) {
            var extent = wrappedLineExtentChar(cm, lineObj, null, pos);
            var prop = (dir == "ltr") == (side == "after") ? "left" : "right";
            var ch = side == "after" ? extent.begin : extent.end - (/\s/.test(lineObj.text.charAt(extent.end - 1)) ? 2 : 1);
            return coords(ch, prop)[prop]
          }

          var order = getOrder(lineObj, doc.direction);
          iterateBidiSections(order, fromArg || 0, toArg == null ? lineLen : toArg, function(from, to, dir, i) {
            var ltr = dir == "ltr";
            var fromPos = coords(from, ltr ? "left" : "right");
            var toPos = coords(to - 1, ltr ? "right" : "left");

            var openStart = fromArg == null && from == 0,
              openEnd = toArg == null && to == lineLen;
            var first = i == 0,
              last = !order || i == order.length - 1;
            if (toPos.top - fromPos.top <= 3) { // Single line
              var openLeft = (docLTR ? openStart : openEnd) && first;
              var openRight = (docLTR ? openEnd : openStart) && last;
              var left = openLeft ? leftSide : (ltr ? fromPos : toPos).left;
              var right = openRight ? rightSide : (ltr ? toPos : fromPos).right;
              add(left, fromPos.top, right - left, fromPos.bottom);
            } else { // Multiple lines
              var topLeft, topRight, botLeft, botRight;
              if (ltr) {
                topLeft = docLTR && openStart && first ? leftSide : fromPos.left;
                topRight = docLTR ? rightSide : wrapX(from, dir, "before");
                botLeft = docLTR ? leftSide : wrapX(to, dir, "after");
                botRight = docLTR && openEnd && last ? rightSide : toPos.right;
              } else {
                topLeft = !docLTR ? leftSide : wrapX(from, dir, "before");
                topRight = !docLTR && openStart && first ? rightSide : fromPos.right;
                botLeft = !docLTR && openEnd && last ? leftSide : toPos.left;
                botRight = !docLTR ? rightSide : wrapX(to, dir, "after");
              }
              add(topLeft, fromPos.top, topRight - topLeft, fromPos.bottom);
              if (fromPos.bottom < toPos.top) {
                add(leftSide, fromPos.bottom, null, toPos.top);
              }
              add(botLeft, toPos.top, botRight - botLeft, toPos.bottom);
            }

            if (!start || cmpCoords(fromPos, start) < 0) {
              start = fromPos;
            }
            if (cmpCoords(toPos, start) < 0) {
              start = toPos;
            }
            if (!end || cmpCoords(fromPos, end) < 0) {
              end = fromPos;
            }
            if (cmpCoords(toPos, end) < 0) {
              end = toPos;
            }
          });
          return {
            start: start,
            end: end
          }
        }

        var sFrom = range$$1.from(),
          sTo = range$$1.to();
        if (sFrom.line == sTo.line) {
          drawForLine(sFrom.line, sFrom.ch, sTo.ch);
        } else {
          var fromLine = getLine(doc, sFrom.line),
            toLine = getLine(doc, sTo.line);
          var singleVLine = visualLine(fromLine) == visualLine(toLine);
          var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;
          var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;
          if (singleVLine) {
            if (leftEnd.top < rightStart.top - 2) {
              add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
              add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
            } else {
              add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
            }
          }
          if (leftEnd.bottom < rightStart.top) {
            add(leftSide, leftEnd.bottom, null, rightStart.top);
          }
        }

        output.appendChild(fragment);
      }

      // Cursor-blinking
      function restartBlink(cm) {
        if (!cm.state.focused) {
          return
        }
        var display = cm.display;
        clearInterval(display.blinker);
        var on = true;
        display.cursorDiv.style.visibility = "";
        if (cm.options.cursorBlinkRate > 0) {
          display.blinker = setInterval(function() {
              return display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden";
            },
            cm.options.cursorBlinkRate);
        } else if (cm.options.cursorBlinkRate < 0) {
          display.cursorDiv.style.visibility = "hidden";
        }
      }

      function ensureFocus(cm) {
        if (!cm.state.focused) {
          cm.display.input.focus();
          onFocus(cm);
        }
      }

      function delayBlurEvent(cm) {
        cm.state.delayingBlurEvent = true;
        setTimeout(function() {
          if (cm.state.delayingBlurEvent) {
            cm.state.delayingBlurEvent = false;
            onBlur(cm);
          }
        }, 100);
      }

      function onFocus(cm, e) {
        if (cm.state.delayingBlurEvent) {
          cm.state.delayingBlurEvent = false;
        }

        if (cm.options.readOnly == "nocursor") {
          return
        }
        if (!cm.state.focused) {
          signal(cm, "focus", cm, e);
          cm.state.focused = true;
          addClass(cm.display.wrapper, "CodeMirror-focused");
          // This test prevents this from firing when a context
          // menu is closed (since the input reset would kill the
          // select-all detection hack)
          if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
            cm.display.input.reset();
            if (webkit) {
              setTimeout(function() {
                return cm.display.input.reset(true);
              }, 20);
            } // Issue #1730
          }
          cm.display.input.receivedFocus();
        }
        restartBlink(cm);
      }

      function onBlur(cm, e) {
        if (cm.state.delayingBlurEvent) {
          return
        }

        if (cm.state.focused) {
          signal(cm, "blur", cm, e);
          cm.state.focused = false;
          rmClass(cm.display.wrapper, "CodeMirror-focused");
        }
        clearInterval(cm.display.blinker);
        setTimeout(function() {
          if (!cm.state.focused) {
            cm.display.shift = false;
          }
        }, 150);
      }

      // Read the actual heights of the rendered lines, and update their
      // stored heights to match.
      function updateHeightsInViewport(cm) {
        var display = cm.display;
        var prevBottom = display.lineDiv.offsetTop;
        for (var i = 0; i < display.view.length; i++) {
          var cur = display.view[i],
            height = (void 0);
          if (cur.hidden) {
            continue
          }
          if (ie && ie_version < 8) {
            var bot = cur.node.offsetTop + cur.node.offsetHeight;
            height = bot - prevBottom;
            prevBottom = bot;
          } else {
            var box = cur.node.getBoundingClientRect();
            height = box.bottom - box.top;
          }
          var diff = cur.line.height - height;
          if (height < 2) {
            height = textHeight(display);
          }
          if (diff > .005 || diff < -.005) {
            updateLineHeight(cur.line, height);
            updateWidgetHeight(cur.line);
            if (cur.rest) {
              for (var j = 0; j < cur.rest.length; j++) {
                updateWidgetHeight(cur.rest[j]);
              }
            }
          }
        }
      }

      // Read and store the height of line widgets associated with the
      // given line.
      function updateWidgetHeight(line) {
        if (line.widgets) {
          for (var i = 0; i < line.widgets.length; ++i) {
            var w = line.widgets[i],
              parent = w.node.parentNode;
            if (parent) {
              w.height = parent.offsetHeight;
            }
          }
        }
      }

      // Compute the lines that are visible in a given viewport (defaults
      // the the current scroll position). viewport may contain top,
      // height, and ensure (see op.scrollToPos) properties.
      function visibleLines(display, doc, viewport) {
        var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;
        top = Math.floor(top - paddingTop(display));
        var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;

        var from = lineAtHeight(doc, top),
          to = lineAtHeight(doc, bottom);
        // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
        // forces those lines into the viewport (if possible).
        if (viewport && viewport.ensure) {
          var ensureFrom = viewport.ensure.from.line,
            ensureTo = viewport.ensure.to.line;
          if (ensureFrom < from) {
            from = ensureFrom;
            to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);
          } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
            from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);
            to = ensureTo;
          }
        }
        return {
          from: from,
          to: Math.max(to, from + 1)
        }
      }

      // Re-align line numbers and gutter marks to compensate for
      // horizontal scrolling.
      function alignHorizontally(cm) {
        var display = cm.display,
          view = display.view;
        if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) {
          return
        }
        var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
        var gutterW = display.gutters.offsetWidth,
          left = comp + "px";
        for (var i = 0; i < view.length; i++) {
          if (!view[i].hidden) {
            if (cm.options.fixedGutter) {
              if (view[i].gutter) {
                view[i].gutter.style.left = left;
              }
              if (view[i].gutterBackground) {
                view[i].gutterBackground.style.left = left;
              }
            }
            var align = view[i].alignable;
            if (align) {
              for (var j = 0; j < align.length; j++) {
                align[j].style.left = left;
              }
            }
          }
        }
        if (cm.options.fixedGutter) {
          display.gutters.style.left = (comp + gutterW) + "px";
        }
      }

      // Used to ensure that the line number gutter is still the right
      // size for the current document size. Returns true when an update
      // is needed.
      function maybeUpdateLineNumberWidth(cm) {
        if (!cm.options.lineNumbers) {
          return false
        }
        var doc = cm.doc,
          last = lineNumberFor(cm.options, doc.first + doc.size - 1),
          display = cm.display;
        if (last.length != display.lineNumChars) {
          var test = display.measure.appendChild(elt("div", [elt("div", last)],
            "CodeMirror-linenumber CodeMirror-gutter-elt"));
          var innerW = test.firstChild.offsetWidth,
            padding = test.offsetWidth - innerW;
          display.lineGutter.style.width = "";
          display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;
          display.lineNumWidth = display.lineNumInnerWidth + padding;
          display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
          display.lineGutter.style.width = display.lineNumWidth + "px";
          updateGutterSpace(cm);
          return true
        }
        return false
      }

      // SCROLLING THINGS INTO VIEW

      // If an editor sits on the top or bottom of the window, partially
      // scrolled out of view, this ensures that the cursor is visible.
      function maybeScrollWindow(cm, rect) {
        if (signalDOMEvent(cm, "scrollCursorIntoView")) {
          return
        }

        var display = cm.display,
          box = display.sizer.getBoundingClientRect(),
          doScroll = null;
        if (rect.top + box.top < 0) {
          doScroll = true;
        } else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) {
          doScroll = false;
        }
        if (doScroll != null && !phantom) {
          var scrollNode = elt("div", "\u200b", null, ("position: absolute;\n                         top: " + (rect.top - display.viewOffset - paddingTop(cm.display)) + "px;\n                         height: " + (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) + "px;\n                         left: " + (rect.left) + "px; width: " + (Math.max(2, rect.right - rect.left)) + "px;"));
          cm.display.lineSpace.appendChild(scrollNode);
          scrollNode.scrollIntoView(doScroll);
          cm.display.lineSpace.removeChild(scrollNode);
        }
      }

      // Scroll a given position into view (immediately), verifying that
      // it actually became visible (as line heights are accurately
      // measured, the position of something may 'drift' during drawing).
      function scrollPosIntoView(cm, pos, end, margin) {
        if (margin == null) {
          margin = 0;
        }
        var rect;
        if (!cm.options.lineWrapping && pos == end) {
          // Set pos and end to the cursor positions around the character pos sticks to
          // If pos.sticky == "before", that is around pos.ch - 1, otherwise around pos.ch
          // If pos == Pos(_, 0, "before"), pos and end are unchanged
          pos = pos.ch ? Pos(pos.line, pos.sticky == "before" ? pos.ch - 1 : pos.ch, "after") : pos;
          end = pos.sticky == "before" ? Pos(pos.line, pos.ch + 1, "before") : pos;
        }
        for (var limit = 0; limit < 5; limit++) {
          var changed = false;
          var coords = cursorCoords(cm, pos);
          var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
          rect = {
            left: Math.min(coords.left, endCoords.left),
            top: Math.min(coords.top, endCoords.top) - margin,
            right: Math.max(coords.left, endCoords.left),
            bottom: Math.max(coords.bottom, endCoords.bottom) + margin
          };
          var scrollPos = calculateScrollPos(cm, rect);
          var startTop = cm.doc.scrollTop,
            startLeft = cm.doc.scrollLeft;
          if (scrollPos.scrollTop != null) {
            updateScrollTop(cm, scrollPos.scrollTop);
            if (Math.abs(cm.doc.scrollTop - startTop) > 1) {
              changed = true;
            }
          }
          if (scrollPos.scrollLeft != null) {
            setScrollLeft(cm, scrollPos.scrollLeft);
            if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) {
              changed = true;
            }
          }
          if (!changed) {
            break
          }
        }
        return rect
      }

      // Scroll a given set of coordinates into view (immediately).
      function scrollIntoView(cm, rect) {
        var scrollPos = calculateScrollPos(cm, rect);
        if (scrollPos.scrollTop != null) {
          updateScrollTop(cm, scrollPos.scrollTop);
        }
        if (scrollPos.scrollLeft != null) {
          setScrollLeft(cm, scrollPos.scrollLeft);
        }
      }

      // Calculate a new scroll position needed to scroll the given
      // rectangle into view. Returns an object with scrollTop and
      // scrollLeft properties. When these are undefined, the
      // vertical/horizontal position does not need to be adjusted.
      function calculateScrollPos(cm, rect) {
        var display = cm.display,
          snapMargin = textHeight(cm.display);
        if (rect.top < 0) {
          rect.top = 0;
        }
        var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;
        var screen = displayHeight(cm),
          result = {};
        if (rect.bottom - rect.top > screen) {
          rect.bottom = rect.top + screen;
        }
        var docBottom = cm.doc.height + paddingVert(display);
        var atTop = rect.top < snapMargin,
          atBottom = rect.bottom > docBottom - snapMargin;
        if (rect.top < screentop) {
          result.scrollTop = atTop ? 0 : rect.top;
        } else if (rect.bottom > screentop + screen) {
          var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen);
          if (newTop != screentop) {
            result.scrollTop = newTop;
          }
        }

        var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft;
        var screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0);
        var tooWide = rect.right - rect.left > screenw;
        if (tooWide) {
          rect.right = rect.left + screenw;
        }
        if (rect.left < 10) {
          result.scrollLeft = 0;
        } else if (rect.left < screenleft) {
          result.scrollLeft = Math.max(0, rect.left - (tooWide ? 0 : 10));
        } else if (rect.right > screenw + screenleft - 3) {
          result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw;
        }
        return result
      }

      // Store a relative adjustment to the scroll position in the current
      // operation (to be applied when the operation finishes).
      function addToScrollTop(cm, top) {
        if (top == null) {
          return
        }
        resolveScrollToPos(cm);
        cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;
      }

      // Make sure that at the end of the operation the current cursor is
      // shown.
      function ensureCursorVisible(cm) {
        resolveScrollToPos(cm);
        var cur = cm.getCursor();
        cm.curOp.scrollToPos = {
          from: cur,
          to: cur,
          margin: cm.options.cursorScrollMargin
        };
      }

      function scrollToCoords(cm, x, y) {
        if (x != null || y != null) {
          resolveScrollToPos(cm);
        }
        if (x != null) {
          cm.curOp.scrollLeft = x;
        }
        if (y != null) {
          cm.curOp.scrollTop = y;
        }
      }

      function scrollToRange(cm, range$$1) {
        resolveScrollToPos(cm);
        cm.curOp.scrollToPos = range$$1;
      }

      // When an operation has its scrollToPos property set, and another
      // scroll action is applied before the end of the operation, this
      // 'simulates' scrolling that position into view in a cheap way, so
      // that the effect of intermediate scroll commands is not ignored.
      function resolveScrollToPos(cm) {
        var range$$1 = cm.curOp.scrollToPos;
        if (range$$1) {
          cm.curOp.scrollToPos = null;
          var from = estimateCoords(cm, range$$1.from),
            to = estimateCoords(cm, range$$1.to);
          scrollToCoordsRange(cm, from, to, range$$1.margin);
        }
      }

      function scrollToCoordsRange(cm, from, to, margin) {
        var sPos = calculateScrollPos(cm, {
          left: Math.min(from.left, to.left),
          top: Math.min(from.top, to.top) - margin,
          right: Math.max(from.right, to.right),
          bottom: Math.max(from.bottom, to.bottom) + margin
        });
        scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop);
      }

      // Sync the scrollable area and scrollbars, ensure the viewport
      // covers the visible area.
      function updateScrollTop(cm, val) {
        if (Math.abs(cm.doc.scrollTop - val) < 2) {
          return
        }
        if (!gecko) {
          updateDisplaySimple(cm, {
            top: val
          });
        }
        setScrollTop(cm, val, true);
        if (gecko) {
          updateDisplaySimple(cm);
        }
        startWorker(cm, 100);
      }

      function setScrollTop(cm, val, forceScroll) {
        val = Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val);
        if (cm.display.scroller.scrollTop == val && !forceScroll) {
          return
        }
        cm.doc.scrollTop = val;
        cm.display.scrollbars.setScrollTop(val);
        if (cm.display.scroller.scrollTop != val) {
          cm.display.scroller.scrollTop = val;
        }
      }

      // Sync scroller and scrollbar, ensure the gutter elements are
      // aligned.
      function setScrollLeft(cm, val, isScroller, forceScroll) {
        val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth);
        if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) {
          return
        }
        cm.doc.scrollLeft = val;
        alignHorizontally(cm);
        if (cm.display.scroller.scrollLeft != val) {
          cm.display.scroller.scrollLeft = val;
        }
        cm.display.scrollbars.setScrollLeft(val);
      }

      // SCROLLBARS

      // Prepare DOM reads needed to update the scrollbars. Done in one
      // shot to minimize update/measure roundtrips.
      function measureForScrollbars(cm) {
        var d = cm.display,
          gutterW = d.gutters.offsetWidth;
        var docH = Math.round(cm.doc.height + paddingVert(cm.display));
        return {
          clientHeight: d.scroller.clientHeight,
          viewHeight: d.wrapper.clientHeight,
          scrollWidth: d.scroller.scrollWidth,
          clientWidth: d.scroller.clientWidth,
          viewWidth: d.wrapper.clientWidth,
          barLeft: cm.options.fixedGutter ? gutterW : 0,
          docHeight: docH,
          scrollHeight: docH + scrollGap(cm) + d.barHeight,
          nativeBarWidth: d.nativeBarWidth,
          gutterWidth: gutterW
        }
      }

      var NativeScrollbars = function(place, scroll, cm) {
        this.cm = cm;
        var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
        var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
        place(vert);
        place(horiz);

        on(vert, "scroll", function() {
          if (vert.clientHeight) {
            scroll(vert.scrollTop, "vertical");
          }
        });
        on(horiz, "scroll", function() {
          if (horiz.clientWidth) {
            scroll(horiz.scrollLeft, "horizontal");
          }
        });

        this.checkedZeroWidth = false;
        // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
        if (ie && ie_version < 8) {
          this.horiz.style.minHeight = this.vert.style.minWidth = "18px";
        }
      };

      NativeScrollbars.prototype.update = function(measure) {
        var needsH = measure.scrollWidth > measure.clientWidth + 1;
        var needsV = measure.scrollHeight > measure.clientHeight + 1;
        var sWidth = measure.nativeBarWidth;

        if (needsV) {
          this.vert.style.display = "block";
          this.vert.style.bottom = needsH ? sWidth + "px" : "0";
          var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);
          // A bug in IE8 can cause this value to be negative, so guard it.
          this.vert.firstChild.style.height =
            Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px";
        } else {
          this.vert.style.display = "";
          this.vert.firstChild.style.height = "0";
        }

        if (needsH) {
          this.horiz.style.display = "block";
          this.horiz.style.right = needsV ? sWidth + "px" : "0";
          this.horiz.style.left = measure.barLeft + "px";
          var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
          this.horiz.firstChild.style.width =
            Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
        } else {
          this.horiz.style.display = "";
          this.horiz.firstChild.style.width = "0";
        }

        if (!this.checkedZeroWidth && measure.clientHeight > 0) {
          if (sWidth == 0) {
            this.zeroWidthHack();
          }
          this.checkedZeroWidth = true;
        }

        return {
          right: needsV ? sWidth : 0,
          bottom: needsH ? sWidth : 0
        }
      };

      NativeScrollbars.prototype.setScrollLeft = function(pos) {
        if (this.horiz.scrollLeft != pos) {
          this.horiz.scrollLeft = pos;
        }
        if (this.disableHoriz) {
          this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz");
        }
      };

      NativeScrollbars.prototype.setScrollTop = function(pos) {
        if (this.vert.scrollTop != pos) {
          this.vert.scrollTop = pos;
        }
        if (this.disableVert) {
          this.enableZeroWidthBar(this.vert, this.disableVert, "vert");
        }
      };

      NativeScrollbars.prototype.zeroWidthHack = function() {
        var w = mac && !mac_geMountainLion ? "12px" : "18px";
        this.horiz.style.height = this.vert.style.width = w;
        this.horiz.style.pointerEvents = this.vert.style.pointerEvents = "none";
        this.disableHoriz = new Delayed;
        this.disableVert = new Delayed;
      };

      NativeScrollbars.prototype.enableZeroWidthBar = function(bar, delay, type) {
        bar.style.pointerEvents = "auto";

        function maybeDisable() {
          // To find out whether the scrollbar is still visible, we
          // check whether the element under the pixel in the bottom
          // right corner of the scrollbar box is the scrollbar box
          // itself (when the bar is still visible) or its filler child
          // (when the bar is hidden). If it is still visible, we keep
          // it enabled, if it's hidden, we disable pointer events.
          var box = bar.getBoundingClientRect();
          var elt$$1 = type == "vert" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2) :
            document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1);
          if (elt$$1 != bar) {
            bar.style.pointerEvents = "none";
          } else {
            delay.set(1000, maybeDisable);
          }
        }
        delay.set(1000, maybeDisable);
      };

      NativeScrollbars.prototype.clear = function() {
        var parent = this.horiz.parentNode;
        parent.removeChild(this.horiz);
        parent.removeChild(this.vert);
      };

      var NullScrollbars = function() {};

      NullScrollbars.prototype.update = function() {
        return {
          bottom: 0,
          right: 0
        }
      };
      NullScrollbars.prototype.setScrollLeft = function() {};
      NullScrollbars.prototype.setScrollTop = function() {};
      NullScrollbars.prototype.clear = function() {};

      function updateScrollbars(cm, measure) {
        if (!measure) {
          measure = measureForScrollbars(cm);
        }
        var startWidth = cm.display.barWidth,
          startHeight = cm.display.barHeight;
        updateScrollbarsInner(cm, measure);
        for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
          if (startWidth != cm.display.barWidth && cm.options.lineWrapping) {
            updateHeightsInViewport(cm);
          }
          updateScrollbarsInner(cm, measureForScrollbars(cm));
          startWidth = cm.display.barWidth;
          startHeight = cm.display.barHeight;
        }
      }

      // Re-synchronize the fake scrollbars with the actual size of the
      // content.
      function updateScrollbarsInner(cm, measure) {
        var d = cm.display;
        var sizes = d.scrollbars.update(measure);

        d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
        d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";
        d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent";

        if (sizes.right && sizes.bottom) {
          d.scrollbarFiller.style.display = "block";
          d.scrollbarFiller.style.height = sizes.bottom + "px";
          d.scrollbarFiller.style.width = sizes.right + "px";
        } else {
          d.scrollbarFiller.style.display = "";
        }
        if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
          d.gutterFiller.style.display = "block";
          d.gutterFiller.style.height = sizes.bottom + "px";
          d.gutterFiller.style.width = measure.gutterWidth + "px";
        } else {
          d.gutterFiller.style.display = "";
        }
      }

      var scrollbarModel = {
        "native": NativeScrollbars,
        "null": NullScrollbars
      };

      function initScrollbars(cm) {
        if (cm.display.scrollbars) {
          cm.display.scrollbars.clear();
          if (cm.display.scrollbars.addClass) {
            rmClass(cm.display.wrapper, cm.display.scrollbars.addClass);
          }
        }

        cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function(node) {
          cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
          // Prevent clicks in the scrollbars from killing focus
          on(node, "mousedown", function() {
            if (cm.state.focused) {
              setTimeout(function() {
                return cm.display.input.focus();
              }, 0);
            }
          });
          node.setAttribute("cm-not-content", "true");
        }, function(pos, axis) {
          if (axis == "horizontal") {
            setScrollLeft(cm, pos);
          } else {
            updateScrollTop(cm, pos);
          }
        }, cm);
        if (cm.display.scrollbars.addClass) {
          addClass(cm.display.wrapper, cm.display.scrollbars.addClass);
        }
      }

      // Operations are used to wrap a series of changes to the editor
      // state in such a way that each change won't have to update the
      // cursor and display (which would be awkward, slow, and
      // error-prone). Instead, display updates are batched and then all
      // combined and executed at once.

      var nextOpId = 0;
      // Start a new operation.
      function startOperation(cm) {
        cm.curOp = {
          cm: cm,
          viewChanged: false, // Flag that indicates that lines might need to be redrawn
          startHeight: cm.doc.height, // Used to detect need to update scrollbar
          forceUpdate: false, // Used to force a redraw
          updateInput: null, // Whether to reset the input textarea
          typing: false, // Whether this reset should be careful to leave existing text (for compositing)
          changeObjs: null, // Accumulated changes, for firing change events
          cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
          cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
          selectionChanged: false, // Whether the selection needs to be redrawn
          updateMaxLine: false, // Set when the widest line needs to be determined anew
          scrollLeft: null,
          scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
          scrollToPos: null, // Used to scroll to a specific position
          focus: false,
          id: ++nextOpId // Unique ID
        };
        pushOperation(cm.curOp);
      }

      // Finish an operation, updating the display and signalling delayed events
      function endOperation(cm) {
        var op = cm.curOp;
        finishOperation(op, function(group) {
          for (var i = 0; i < group.ops.length; i++) {
            group.ops[i].cm.curOp = null;
          }
          endOperations(group);
        });
      }

      // The DOM updates done when an operation finishes are batched so
      // that the minimum number of relayouts are required.
      function endOperations(group) {
        var ops = group.ops;
        for (var i = 0; i < ops.length; i++) // Read DOM
        {
          endOperation_R1(ops[i]);
        }
        for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)
        {
          endOperation_W1(ops[i$1]);
        }
        for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM
        {
          endOperation_R2(ops[i$2]);
        }
        for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)
        {
          endOperation_W2(ops[i$3]);
        }
        for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM
        {
          endOperation_finish(ops[i$4]);
        }
      }

      function endOperation_R1(op) {
        var cm = op.cm,
          display = cm.display;
        maybeClipScrollbars(cm);
        if (op.updateMaxLine) {
          findMaxLine(cm);
        }

        op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||
          op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
            op.scrollToPos.to.line >= display.viewTo) ||
          display.maxLineChanged && cm.options.lineWrapping;
        op.update = op.mustUpdate &&
          new DisplayUpdate(cm, op.mustUpdate && {
            top: op.scrollTop,
            ensure: op.scrollToPos
          }, op.forceUpdate);
      }

      function endOperation_W1(op) {
        op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
      }

      function endOperation_R2(op) {
        var cm = op.cm,
          display = cm.display;
        if (op.updatedDisplay) {
          updateHeightsInViewport(cm);
        }

        op.barMeasure = measureForScrollbars(cm);

        // If the max line changed since it was last measured, measure it,
        // and ensure the document's width matches it.
        // updateDisplay_W2 will use these properties to do the actual resizing
        if (display.maxLineChanged && !cm.options.lineWrapping) {
          op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
          cm.display.sizerWidth = op.adjustWidthTo;
          op.barMeasure.scrollWidth =
            Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
          op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
        }

        if (op.updatedDisplay || op.selectionChanged) {
          op.preparedSelection = display.input.prepareSelection();
        }
      }

      function endOperation_W2(op) {
        var cm = op.cm;

        if (op.adjustWidthTo != null) {
          cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
          if (op.maxScrollLeft < cm.doc.scrollLeft) {
            setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true);
          }
          cm.display.maxLineChanged = false;
        }

        var takeFocus = op.focus && op.focus == activeElt();
        if (op.preparedSelection) {
          cm.display.input.showSelection(op.preparedSelection, takeFocus);
        }
        if (op.updatedDisplay || op.startHeight != cm.doc.height) {
          updateScrollbars(cm, op.barMeasure);
        }
        if (op.updatedDisplay) {
          setDocumentHeight(cm, op.barMeasure);
        }

        if (op.selectionChanged) {
          restartBlink(cm);
        }

        if (cm.state.focused && op.updateInput) {
          cm.display.input.reset(op.typing);
        }
        if (takeFocus) {
          ensureFocus(op.cm);
        }
      }

      function endOperation_finish(op) {
        var cm = op.cm,
          display = cm.display,
          doc = cm.doc;

        if (op.updatedDisplay) {
          postUpdateDisplay(cm, op.update);
        }

        // Abort mouse wheel delta measurement, when scrolling explicitly
        if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos)) {
          display.wheelStartX = display.wheelStartY = null;
        }

        // Propagate the scroll position to the actual DOM scroller
        if (op.scrollTop != null) {
          setScrollTop(cm, op.scrollTop, op.forceScroll);
        }

        if (op.scrollLeft != null) {
          setScrollLeft(cm, op.scrollLeft, true, true);
        }
        // If we need to scroll a specific position into view, do so.
        if (op.scrollToPos) {
          var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
            clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
          maybeScrollWindow(cm, rect);
        }

        // Fire events for markers that are hidden/unidden by editing or
        // undoing
        var hidden = op.maybeHiddenMarkers,
          unhidden = op.maybeUnhiddenMarkers;
        if (hidden) {
          for (var i = 0; i < hidden.length; ++i) {
            if (!hidden[i].lines.length) {
              signal(hidden[i], "hide");
            }
          }
        }
        if (unhidden) {
          for (var i$1 = 0; i$1 < unhidden.length; ++i$1) {
            if (unhidden[i$1].lines.length) {
              signal(unhidden[i$1], "unhide");
            }
          }
        }

        if (display.wrapper.offsetHeight) {
          doc.scrollTop = cm.display.scroller.scrollTop;
        }

        // Fire change events, and delayed event handlers
        if (op.changeObjs) {
          signal(cm, "changes", cm, op.changeObjs);
        }
        if (op.update) {
          op.update.finish();
        }
      }

      // Run the given function in an operation
      function runInOp(cm, f) {
        if (cm.curOp) {
          return f()
        }
        startOperation(cm);
        try {
          return f()
        } finally {
          endOperation(cm);
        }
      }
      // Wraps a function in an operation. Returns the wrapped function.
      function operation(cm, f) {
        return function() {
          if (cm.curOp) {
            return f.apply(cm, arguments)
          }
          startOperation(cm);
          try {
            return f.apply(cm, arguments)
          } finally {
            endOperation(cm);
          }
        }
      }
      // Used to add methods to editor and doc instances, wrapping them in
      // operations.
      function methodOp(f) {
        return function() {
          if (this.curOp) {
            return f.apply(this, arguments)
          }
          startOperation(this);
          try {
            return f.apply(this, arguments)
          } finally {
            endOperation(this);
          }
        }
      }

      function docMethodOp(f) {
        return function() {
          var cm = this.cm;
          if (!cm || cm.curOp) {
            return f.apply(this, arguments)
          }
          startOperation(cm);
          try {
            return f.apply(this, arguments)
          } finally {
            endOperation(cm);
          }
        }
      }

      // Updates the display.view data structure for a given change to the
      // document. From and to are in pre-change coordinates. Lendiff is
      // the amount of lines added or subtracted by the change. This is
      // used for changes that span multiple lines, or change the way
      // lines are divided into visual lines. regLineChange (below)
      // registers single-line changes.
      function regChange(cm, from, to, lendiff) {
        if (from == null) {
          from = cm.doc.first;
        }
        if (to == null) {
          to = cm.doc.first + cm.doc.size;
        }
        if (!lendiff) {
          lendiff = 0;
        }

        var display = cm.display;
        if (lendiff && to < display.viewTo &&
          (display.updateLineNumbers == null || display.updateLineNumbers > from)) {
          display.updateLineNumbers = from;
        }

        cm.curOp.viewChanged = true;

        if (from >= display.viewTo) { // Change after
          if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo) {
            resetView(cm);
          }
        } else if (to <= display.viewFrom) { // Change before
          if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
            resetView(cm);
          } else {
            display.viewFrom += lendiff;
            display.viewTo += lendiff;
          }
        } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
          resetView(cm);
        } else if (from <= display.viewFrom) { // Top overlap
          var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
          if (cut) {
            display.view = display.view.slice(cut.index);
            display.viewFrom = cut.lineN;
            display.viewTo += lendiff;
          } else {
            resetView(cm);
          }
        } else if (to >= display.viewTo) { // Bottom overlap
          var cut$1 = viewCuttingPoint(cm, from, from, -1);
          if (cut$1) {
            display.view = display.view.slice(0, cut$1.index);
            display.viewTo = cut$1.lineN;
          } else {
            resetView(cm);
          }
        } else { // Gap in the middle
          var cutTop = viewCuttingPoint(cm, from, from, -1);
          var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
          if (cutTop && cutBot) {
            display.view = display.view.slice(0, cutTop.index)
              .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
              .concat(display.view.slice(cutBot.index));
            display.viewTo += lendiff;
          } else {
            resetView(cm);
          }
        }

        var ext = display.externalMeasured;
        if (ext) {
          if (to < ext.lineN) {
            ext.lineN += lendiff;
          } else if (from < ext.lineN + ext.size) {
            display.externalMeasured = null;
          }
        }
      }

      // Register a change to a single line. Type must be one of "text",
      // "gutter", "class", "widget"
      function regLineChange(cm, line, type) {
        cm.curOp.viewChanged = true;
        var display = cm.display,
          ext = cm.display.externalMeasured;
        if (ext && line >= ext.lineN && line < ext.lineN + ext.size) {
          display.externalMeasured = null;
        }

        if (line < display.viewFrom || line >= display.viewTo) {
          return
        }
        var lineView = display.view[findViewIndex(cm, line)];
        if (lineView.node == null) {
          return
        }
        var arr = lineView.changes || (lineView.changes = []);
        if (indexOf(arr, type) == -1) {
          arr.push(type);
        }
      }

      // Clear the view.
      function resetView(cm) {
        cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
        cm.display.view = [];
        cm.display.viewOffset = 0;
      }

      function viewCuttingPoint(cm, oldN, newN, dir) {
        var index = findViewIndex(cm, oldN),
          diff, view = cm.display.view;
        if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size) {
          return {
            index: index,
            lineN: newN
          }
        }
        var n = cm.display.viewFrom;
        for (var i = 0; i < index; i++) {
          n += view[i].size;
        }
        if (n != oldN) {
          if (dir > 0) {
            if (index == view.length - 1) {
              return null
            }
            diff = (n + view[index].size) - oldN;
            index++;
          } else {
            diff = n - oldN;
          }
          oldN += diff;
          newN += diff;
        }
        while (visualLineNo(cm.doc, newN) != newN) {
          if (index == (dir < 0 ? 0 : view.length - 1)) {
            return null
          }
          newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
          index += dir;
        }
        return {
          index: index,
          lineN: newN
        }
      }

      // Force the view to cover a given range, adding empty view element
      // or clipping off existing ones as needed.
      function adjustView(cm, from, to) {
        var display = cm.display,
          view = display.view;
        if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
          display.view = buildViewArray(cm, from, to);
          display.viewFrom = from;
        } else {
          if (display.viewFrom > from) {
            display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view);
          } else if (display.viewFrom < from) {
            display.view = display.view.slice(findViewIndex(cm, from));
          }
          display.viewFrom = from;
          if (display.viewTo < to) {
            display.view = display.view.concat(buildViewArray(cm, display.viewTo, to));
          } else if (display.viewTo > to) {
            display.view = display.view.slice(0, findViewIndex(cm, to));
          }
        }
        display.viewTo = to;
      }

      // Count the number of lines in the view whose DOM representation is
      // out of date (or nonexistent).
      function countDirtyView(cm) {
        var view = cm.display.view,
          dirty = 0;
        for (var i = 0; i < view.length; i++) {
          var lineView = view[i];
          if (!lineView.hidden && (!lineView.node || lineView.changes)) {
            ++dirty;
          }
        }
        return dirty
      }

      // HIGHLIGHT WORKER

      function startWorker(cm, time) {
        if (cm.doc.highlightFrontier < cm.display.viewTo) {
          cm.state.highlight.set(time, bind(highlightWorker, cm));
        }
      }

      function highlightWorker(cm) {
        var doc = cm.doc;
        if (doc.highlightFrontier >= cm.display.viewTo) {
          return
        }
        var end = +new Date + cm.options.workTime;
        var context = getContextBefore(cm, doc.highlightFrontier);
        var changedLines = [];

        doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function(line) {
          if (context.line >= cm.display.viewFrom) { // Visible
            var oldStyles = line.styles;
            var resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null;
            var highlighted = highlightLine(cm, line, context, true);
            if (resetState) {
              context.state = resetState;
            }
            line.styles = highlighted.styles;
            var oldCls = line.styleClasses,
              newCls = highlighted.classes;
            if (newCls) {
              line.styleClasses = newCls;
            } else if (oldCls) {
              line.styleClasses = null;
            }
            var ischange = !oldStyles || oldStyles.length != line.styles.length ||
              oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);
            for (var i = 0; !ischange && i < oldStyles.length; ++i) {
              ischange = oldStyles[i] != line.styles[i];
            }
            if (ischange) {
              changedLines.push(context.line);
            }
            line.stateAfter = context.save();
            context.nextLine();
          } else {
            if (line.text.length <= cm.options.maxHighlightLength) {
              processLine(cm, line.text, context);
            }
            line.stateAfter = context.line % 5 == 0 ? context.save() : null;
            context.nextLine();
          }
          if (+new Date > end) {
            startWorker(cm, cm.options.workDelay);
            return true
          }
        });
        doc.highlightFrontier = context.line;
        doc.modeFrontier = Math.max(doc.modeFrontier, context.line);
        if (changedLines.length) {
          runInOp(cm, function() {
            for (var i = 0; i < changedLines.length; i++) {
              regLineChange(cm, changedLines[i], "text");
            }
          });
        }
      }

      // DISPLAY DRAWING

      var DisplayUpdate = function(cm, viewport, force) {
        var display = cm.display;

        this.viewport = viewport;
        // Store some values that we'll need later (but don't want to force a relayout for)
        this.visible = visibleLines(display, cm.doc, viewport);
        this.editorIsHidden = !display.wrapper.offsetWidth;
        this.wrapperHeight = display.wrapper.clientHeight;
        this.wrapperWidth = display.wrapper.clientWidth;
        this.oldDisplayWidth = displayWidth(cm);
        this.force = force;
        this.dims = getDimensions(cm);
        this.events = [];
      };

      DisplayUpdate.prototype.signal = function(emitter, type) {
        if (hasHandler(emitter, type)) {
          this.events.push(arguments);
        }
      };
      DisplayUpdate.prototype.finish = function() {
        var this$1 = this;

        for (var i = 0; i < this.events.length; i++) {
          signal.apply(null, this$1.events[i]);
        }
      };

      function maybeClipScrollbars(cm) {
        var display = cm.display;
        if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
          display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;
          display.heightForcer.style.height = scrollGap(cm) + "px";
          display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
          display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
          display.scrollbarsClipped = true;
        }
      }

      function selectionSnapshot(cm) {
        if (cm.hasFocus()) {
          return null
        }
        var active = activeElt();
        if (!active || !contains(cm.display.lineDiv, active)) {
          return null
        }
        var result = {
          activeElt: active
        };
        if (window.getSelection) {
          var sel = window.getSelection();
          if (sel.anchorNode && sel.extend && contains(cm.display.lineDiv, sel.anchorNode)) {
            result.anchorNode = sel.anchorNode;
            result.anchorOffset = sel.anchorOffset;
            result.focusNode = sel.focusNode;
            result.focusOffset = sel.focusOffset;
          }
        }
        return result
      }

      function restoreSelection(snapshot) {
        if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt()) {
          return
        }
        snapshot.activeElt.focus();
        if (snapshot.anchorNode && contains(document.body, snapshot.anchorNode) && contains(document.body, snapshot.focusNode)) {
          var sel = window.getSelection(),
            range$$1 = document.createRange();
          range$$1.setEnd(snapshot.anchorNode, snapshot.anchorOffset);
          range$$1.collapse(false);
          sel.removeAllRanges();
          sel.addRange(range$$1);
          sel.extend(snapshot.focusNode, snapshot.focusOffset);
        }
      }

      // Does the actual updating of the line display. Bails out
      // (returning false) when there is nothing to be done and forced is
      // false.
      function updateDisplayIfNeeded(cm, update) {
        var display = cm.display,
          doc = cm.doc;

        if (update.editorIsHidden) {
          resetView(cm);
          return false
        }

        // Bail out if the visible area is already rendered and nothing changed.
        if (!update.force &&
          update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
          (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
          display.renderedView == display.view && countDirtyView(cm) == 0) {
          return false
        }

        if (maybeUpdateLineNumberWidth(cm)) {
          resetView(cm);
          update.dims = getDimensions(cm);
        }

        // Compute a suitable new viewport (from & to)
        var end = doc.first + doc.size;
        var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);
        var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
        if (display.viewFrom < from && from - display.viewFrom < 20) {
          from = Math.max(doc.first, display.viewFrom);
        }
        if (display.viewTo > to && display.viewTo - to < 20) {
          to = Math.min(end, display.viewTo);
        }
        if (sawCollapsedSpans) {
          from = visualLineNo(cm.doc, from);
          to = visualLineEndNo(cm.doc, to);
        }

        var different = from != display.viewFrom || to != display.viewTo ||
          display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;
        adjustView(cm, from, to);

        display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
        // Position the mover div to align with the current scroll position
        cm.display.mover.style.top = display.viewOffset + "px";

        var toUpdate = countDirtyView(cm);
        if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
          (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo)) {
          return false
        }

        // For big changes, we hide the enclosing element during the
        // update, since that speeds up the operations on most browsers.
        var selSnapshot = selectionSnapshot(cm);
        if (toUpdate > 4) {
          display.lineDiv.style.display = "none";
        }
        patchDisplay(cm, display.updateLineNumbers, update.dims);
        if (toUpdate > 4) {
          display.lineDiv.style.display = "";
        }
        display.renderedView = display.view;
        // There might have been a widget with a focused element that got
        // hidden or updated, if so re-focus it.
        restoreSelection(selSnapshot);

        // Prevent selection and cursors from interfering with the scroll
        // width and height.
        removeChildren(display.cursorDiv);
        removeChildren(display.selectionDiv);
        display.gutters.style.height = display.sizer.style.minHeight = 0;

        if (different) {
          display.lastWrapHeight = update.wrapperHeight;
          display.lastWrapWidth = update.wrapperWidth;
          startWorker(cm, 400);
        }

        display.updateLineNumbers = null;

        return true
      }

      function postUpdateDisplay(cm, update) {
        var viewport = update.viewport;

        for (var first = true;; first = false) {
          if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
            // Clip forced viewport to actual scrollable area.
            if (viewport && viewport.top != null) {
              viewport = {
                top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)
              };
            }
            // Updated line heights might result in the drawn area not
            // actually covering the viewport. Keep looping until it does.
            update.visible = visibleLines(cm.display, cm.doc, viewport);
            if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo) {
              break
            }
          }
          if (!updateDisplayIfNeeded(cm, update)) {
            break
          }
          updateHeightsInViewport(cm);
          var barMeasure = measureForScrollbars(cm);
          updateSelection(cm);
          updateScrollbars(cm, barMeasure);
          setDocumentHeight(cm, barMeasure);
          update.force = false;
        }

        update.signal(cm, "update", cm);
        if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
          update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
          cm.display.reportedViewFrom = cm.display.viewFrom;
          cm.display.reportedViewTo = cm.display.viewTo;
        }
      }

      function updateDisplaySimple(cm, viewport) {
        var update = new DisplayUpdate(cm, viewport);
        if (updateDisplayIfNeeded(cm, update)) {
          updateHeightsInViewport(cm);
          postUpdateDisplay(cm, update);
          var barMeasure = measureForScrollbars(cm);
          updateSelection(cm);
          updateScrollbars(cm, barMeasure);
          setDocumentHeight(cm, barMeasure);
          update.finish();
        }
      }

      // Sync the actual display DOM structure with display.view, removing
      // nodes for lines that are no longer in view, and creating the ones
      // that are not there yet, and updating the ones that are out of
      // date.
      function patchDisplay(cm, updateNumbersFrom, dims) {
        var display = cm.display,
          lineNumbers = cm.options.lineNumbers;
        var container = display.lineDiv,
          cur = container.firstChild;

        function rm(node) {
          var next = node.nextSibling;
          // Works around a throw-scroll bug in OS X Webkit
          if (webkit && mac && cm.display.currentWheelTarget == node) {
            node.style.display = "none";
          } else {
            node.parentNode.removeChild(node);
          }
          return next
        }

        var view = display.view,
          lineN = display.viewFrom;
        // Loop over the elements in the view, syncing cur (the DOM nodes
        // in display.lineDiv) with the view as we go.
        for (var i = 0; i < view.length; i++) {
          var lineView = view[i];
          if (lineView.hidden) {} else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
            var node = buildLineElement(cm, lineView, lineN, dims);
            container.insertBefore(node, cur);
          } else { // Already drawn
            while (cur != lineView.node) {
              cur = rm(cur);
            }
            var updateNumber = lineNumbers && updateNumbersFrom != null &&
              updateNumbersFrom <= lineN && lineView.lineNumber;
            if (lineView.changes) {
              if (indexOf(lineView.changes, "gutter") > -1) {
                updateNumber = false;
              }
              updateLineForChanges(cm, lineView, lineN, dims);
            }
            if (updateNumber) {
              removeChildren(lineView.lineNumber);
              lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
            }
            cur = lineView.node.nextSibling;
          }
          lineN += lineView.size;
        }
        while (cur) {
          cur = rm(cur);
        }
      }

      function updateGutterSpace(cm) {
        var width = cm.display.gutters.offsetWidth;
        cm.display.sizer.style.marginLeft = width + "px";
      }

      function setDocumentHeight(cm, measure) {
        cm.display.sizer.style.minHeight = measure.docHeight + "px";
        cm.display.heightForcer.style.top = measure.docHeight + "px";
        cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px";
      }

      // Rebuild the gutter elements, ensure the margin to the left of the
      // code matches their width.
      function updateGutters(cm) {
        var gutters = cm.display.gutters,
          specs = cm.options.gutters;
        removeChildren(gutters);
        var i = 0;
        for (; i < specs.length; ++i) {
          var gutterClass = specs[i];
          var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass));
          if (gutterClass == "CodeMirror-linenumbers") {
            cm.display.lineGutter = gElt;
            gElt.style.width = (cm.display.lineNumWidth || 1) + "px";
          }
        }
        gutters.style.display = i ? "" : "none";
        updateGutterSpace(cm);
      }

      // Make sure the gutters options contains the element
      // "CodeMirror-linenumbers" when the lineNumbers option is true.
      function setGuttersForLineNumbers(options) {
        var found = indexOf(options.gutters, "CodeMirror-linenumbers");
        if (found == -1 && options.lineNumbers) {
          options.gutters = options.gutters.concat(["CodeMirror-linenumbers"]);
        } else if (found > -1 && !options.lineNumbers) {
          options.gutters = options.gutters.slice(0);
          options.gutters.splice(found, 1);
        }
      }

      // Since the delta values reported on mouse wheel events are
      // unstandardized between browsers and even browser versions, and
      // generally horribly unpredictable, this code starts by measuring
      // the scroll effect that the first few mouse wheel events have,
      // and, from that, detects the way it can convert deltas to pixel
      // offsets afterwards.
      //
      // The reason we want to know the amount a wheel event will scroll
      // is that it gives us a chance to update the display before the
      // actual scrolling happens, reducing flickering.

      var wheelSamples = 0;
      var wheelPixelsPerUnit = null;
      // Fill in a browser-detected starting value on browsers where we
      // know one. These don't have to be accurate -- the result of them
      // being wrong would just be a slight flicker on the first wheel
      // scroll (if it is large enough).
      if (ie) {
        wheelPixelsPerUnit = -.53;
      } else if (gecko) {
        wheelPixelsPerUnit = 15;
      } else if (chrome) {
        wheelPixelsPerUnit = -.7;
      } else if (safari) {
        wheelPixelsPerUnit = -1 / 3;
      }

      function wheelEventDelta(e) {
        var dx = e.wheelDeltaX,
          dy = e.wheelDeltaY;
        if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) {
          dx = e.detail;
        }
        if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) {
          dy = e.detail;
        } else if (dy == null) {
          dy = e.wheelDelta;
        }
        return {
          x: dx,
          y: dy
        }
      }

      function wheelEventPixels(e) {
        var delta = wheelEventDelta(e);
        delta.x *= wheelPixelsPerUnit;
        delta.y *= wheelPixelsPerUnit;
        return delta
      }

      function onScrollWheel(cm, e) {
        var delta = wheelEventDelta(e),
          dx = delta.x,
          dy = delta.y;

        var display = cm.display,
          scroll = display.scroller;
        // Quit if there's nothing to scroll here
        var canScrollX = scroll.scrollWidth > scroll.clientWidth;
        var canScrollY = scroll.scrollHeight > scroll.clientHeight;
        if (!(dx && canScrollX || dy && canScrollY)) {
          return
        }

        // Webkit browsers on OS X abort momentum scrolls when the target
        // of the scroll event is removed from the scrollable element.
        // This hack (see related code in patchDisplay) makes sure the
        // element is kept around.
        if (dy && mac && webkit) {
          outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
            for (var i = 0; i < view.length; i++) {
              if (view[i].node == cur) {
                cm.display.currentWheelTarget = cur;
                break outer
              }
            }
          }
        }

        // On some browsers, horizontal scrolling will cause redraws to
        // happen before the gutter has been realigned, causing it to
        // wriggle around in a most unseemly way. When we have an
        // estimated pixels/delta value, we just handle horizontal
        // scrolling entirely here. It'll be slightly off from native, but
        // better than glitching out.
        if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
          if (dy && canScrollY) {
            updateScrollTop(cm, Math.max(0, scroll.scrollTop + dy * wheelPixelsPerUnit));
          }
          setScrollLeft(cm, Math.max(0, scroll.scrollLeft + dx * wheelPixelsPerUnit));
          // Only prevent default scrolling if vertical scrolling is
          // actually possible. Otherwise, it causes vertical scroll
          // jitter on OSX trackpads when deltaX is small and deltaY
          // is large (issue #3579)
          if (!dy || (dy && canScrollY)) {
            e_preventDefault(e);
          }
          display.wheelStartX = null; // Abort measurement, if in progress
          return
        }

        // 'Project' the visible viewport to cover the area that is being
        // scrolled into view (if we know enough to estimate it).
        if (dy && wheelPixelsPerUnit != null) {
          var pixels = dy * wheelPixelsPerUnit;
          var top = cm.doc.scrollTop,
            bot = top + display.wrapper.clientHeight;
          if (pixels < 0) {
            top = Math.max(0, top + pixels - 50);
          } else {
            bot = Math.min(cm.doc.height, bot + pixels + 50);
          }
          updateDisplaySimple(cm, {
            top: top,
            bottom: bot
          });
        }

        if (wheelSamples < 20) {
          if (display.wheelStartX == null) {
            display.wheelStartX = scroll.scrollLeft;
            display.wheelStartY = scroll.scrollTop;
            display.wheelDX = dx;
            display.wheelDY = dy;
            setTimeout(function() {
              if (display.wheelStartX == null) {
                return
              }
              var movedX = scroll.scrollLeft - display.wheelStartX;
              var movedY = scroll.scrollTop - display.wheelStartY;
              var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
                (movedX && display.wheelDX && movedX / display.wheelDX);
              display.wheelStartX = display.wheelStartY = null;
              if (!sample) {
                return
              }
              wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
              ++wheelSamples;
            }, 200);
          } else {
            display.wheelDX += dx;
            display.wheelDY += dy;
          }
        }
      }

      // Selection objects are immutable. A new one is created every time
      // the selection changes. A selection is one or more non-overlapping
      // (and non-touching) ranges, sorted, and an integer that indicates
      // which one is the primary selection (the one that's scrolled into
      // view, that getCursor returns, etc).
      var Selection = function(ranges, primIndex) {
        this.ranges = ranges;
        this.primIndex = primIndex;
      };

      Selection.prototype.primary = function() {
        return this.ranges[this.primIndex]
      };

      Selection.prototype.equals = function(other) {
        var this$1 = this;

        if (other == this) {
          return true
        }
        if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) {
          return false
        }
        for (var i = 0; i < this.ranges.length; i++) {
          var here = this$1.ranges[i],
            there = other.ranges[i];
          if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) {
            return false
          }
        }
        return true
      };

      Selection.prototype.deepCopy = function() {
        var this$1 = this;

        var out = [];
        for (var i = 0; i < this.ranges.length; i++) {
          out[i] = new Range(copyPos(this$1.ranges[i].anchor), copyPos(this$1.ranges[i].head));
        }
        return new Selection(out, this.primIndex)
      };

      Selection.prototype.somethingSelected = function() {
        var this$1 = this;

        for (var i = 0; i < this.ranges.length; i++) {
          if (!this$1.ranges[i].empty()) {
            return true
          }
        }
        return false
      };

      Selection.prototype.contains = function(pos, end) {
        var this$1 = this;

        if (!end) {
          end = pos;
        }
        for (var i = 0; i < this.ranges.length; i++) {
          var range = this$1.ranges[i];
          if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0) {
            return i
          }
        }
        return -1
      };

      var Range = function(anchor, head) {
        this.anchor = anchor;
        this.head = head;
      };

      Range.prototype.from = function() {
        return minPos(this.anchor, this.head)
      };
      Range.prototype.to = function() {
        return maxPos(this.anchor, this.head)
      };
      Range.prototype.empty = function() {
        return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch
      };

      // Take an unsorted, potentially overlapping set of ranges, and
      // build a selection out of it. 'Consumes' ranges array (modifying
      // it).
      function normalizeSelection(ranges, primIndex) {
        var prim = ranges[primIndex];
        ranges.sort(function(a, b) {
          return cmp(a.from(), b.from());
        });
        primIndex = indexOf(ranges, prim);
        for (var i = 1; i < ranges.length; i++) {
          var cur = ranges[i],
            prev = ranges[i - 1];
          if (cmp(prev.to(), cur.from()) >= 0) {
            var from = minPos(prev.from(), cur.from()),
              to = maxPos(prev.to(), cur.to());
            var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;
            if (i <= primIndex) {
              --primIndex;
            }
            ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
          }
        }
        return new Selection(ranges, primIndex)
      }

      function simpleSelection(anchor, head) {
        return new Selection([new Range(anchor, head || anchor)], 0)
      }

      // Compute the position of the end of a change (its 'to' property
      // refers to the pre-change end).
      function changeEnd(change) {
        if (!change.text) {
          return change.to
        }
        return Pos(change.from.line + change.text.length - 1,
          lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))
      }

      // Adjust a position to refer to the post-change position of the
      // same text, or the end of the change if the change covers it.
      function adjustForChange(pos, change) {
        if (cmp(pos, change.from) < 0) {
          return pos
        }
        if (cmp(pos, change.to) <= 0) {
          return changeEnd(change)
        }

        var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1,
          ch = pos.ch;
        if (pos.line == change.to.line) {
          ch += changeEnd(change).ch - change.to.ch;
        }
        return Pos(line, ch)
      }

      function computeSelAfterChange(doc, change) {
        var out = [];
        for (var i = 0; i < doc.sel.ranges.length; i++) {
          var range = doc.sel.ranges[i];
          out.push(new Range(adjustForChange(range.anchor, change),
            adjustForChange(range.head, change)));
        }
        return normalizeSelection(out, doc.sel.primIndex)
      }

      function offsetPos(pos, old, nw) {
        if (pos.line == old.line) {
          return Pos(nw.line, pos.ch - old.ch + nw.ch)
        } else {
          return Pos(nw.line + (pos.line - old.line), pos.ch)
        }
      }

      // Used by replaceSelections to allow moving the selection to the
      // start or around the replaced test. Hint may be "start" or "around".
      function computeReplacedSel(doc, changes, hint) {
        var out = [];
        var oldPrev = Pos(doc.first, 0),
          newPrev = oldPrev;
        for (var i = 0; i < changes.length; i++) {
          var change = changes[i];
          var from = offsetPos(change.from, oldPrev, newPrev);
          var to = offsetPos(changeEnd(change), oldPrev, newPrev);
          oldPrev = change.to;
          newPrev = to;
          if (hint == "around") {
            var range = doc.sel.ranges[i],
              inv = cmp(range.head, range.anchor) < 0;
            out[i] = new Range(inv ? to : from, inv ? from : to);
          } else {
            out[i] = new Range(from, from);
          }
        }
        return new Selection(out, doc.sel.primIndex)
      }

      // Used to get the editor into a consistent state again when options change.

      function loadMode(cm) {
        cm.doc.mode = getMode(cm.options, cm.doc.modeOption);
        resetModeState(cm);
      }

      function resetModeState(cm) {
        cm.doc.iter(function(line) {
          if (line.stateAfter) {
            line.stateAfter = null;
          }
          if (line.styles) {
            line.styles = null;
          }
        });
        cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first;
        startWorker(cm, 100);
        cm.state.modeGen++;
        if (cm.curOp) {
          regChange(cm);
        }
      }

      // DOCUMENT DATA STRUCTURE

      // By default, updates that start and end at the beginning of a line
      // are treated specially, in order to make the association of line
      // widgets and marker elements with the text behave more intuitive.
      function isWholeLineUpdate(doc, change) {
        return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
          (!doc.cm || doc.cm.options.wholeLineUpdateBefore)
      }

      // Perform a change on the document data structure.
      function updateDoc(doc, change, markedSpans, estimateHeight$$1) {
        function spansFor(n) {
          return markedSpans ? markedSpans[n] : null
        }

        function update(line, text, spans) {
          updateLine(line, text, spans, estimateHeight$$1);
          signalLater(line, "change", line, change);
        }

        function linesFor(start, end) {
          var result = [];
          for (var i = start; i < end; ++i) {
            result.push(new Line(text[i], spansFor(i), estimateHeight$$1));
          }
          return result
        }

        var from = change.from,
          to = change.to,
          text = change.text;
        var firstLine = getLine(doc, from.line),
          lastLine = getLine(doc, to.line);
        var lastText = lst(text),
          lastSpans = spansFor(text.length - 1),
          nlines = to.line - from.line;

        // Adjust the line structure
        if (change.full) {
          doc.insert(0, linesFor(0, text.length));
          doc.remove(text.length, doc.size - text.length);
        } else if (isWholeLineUpdate(doc, change)) {
          // This is a whole-line replace. Treated specially to make
          // sure line objects move the way they are supposed to.
          var added = linesFor(0, text.length - 1);
          update(lastLine, lastLine.text, lastSpans);
          if (nlines) {
            doc.remove(from.line, nlines);
          }
          if (added.length) {
            doc.insert(from.line, added);
          }
        } else if (firstLine == lastLine) {
          if (text.length == 1) {
            update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
          } else {
            var added$1 = linesFor(1, text.length - 1);
            added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight$$1));
            update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
            doc.insert(from.line + 1, added$1);
          }
        } else if (text.length == 1) {
          update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
          doc.remove(from.line + 1, nlines);
        } else {
          update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
          update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
          var added$2 = linesFor(1, text.length - 1);
          if (nlines > 1) {
            doc.remove(from.line + 1, nlines - 1);
          }
          doc.insert(from.line + 1, added$2);
        }

        signalLater(doc, "change", doc, change);
      }

      // Call f for all linked documents.
      function linkedDocs(doc, f, sharedHistOnly) {
        function propagate(doc, skip, sharedHist) {
          if (doc.linked) {
            for (var i = 0; i < doc.linked.length; ++i) {
              var rel = doc.linked[i];
              if (rel.doc == skip) {
                continue
              }
              var shared = sharedHist && rel.sharedHist;
              if (sharedHistOnly && !shared) {
                continue
              }
              f(rel.doc, shared);
              propagate(rel.doc, doc, shared);
            }
          }
        }
        propagate(doc, null, true);
      }

      // Attach a document to an editor.
      function attachDoc(cm, doc) {
        if (doc.cm) {
          throw new Error("This document is already in use.")
        }
        cm.doc = doc;
        doc.cm = cm;
        estimateLineHeights(cm);
        loadMode(cm);
        setDirectionClass(cm);
        if (!cm.options.lineWrapping) {
          findMaxLine(cm);
        }
        cm.options.mode = doc.modeOption;
        regChange(cm);
      }

      function setDirectionClass(cm) {
        (cm.doc.direction == "rtl" ? addClass : rmClass)(cm.display.lineDiv, "CodeMirror-rtl");
      }

      function directionChanged(cm) {
        runInOp(cm, function() {
          setDirectionClass(cm);
          regChange(cm);
        });
      }

      function History(startGen) {
        // Arrays of change events and selections. Doing something adds an
        // event to done and clears undo. Undoing moves events from done
        // to undone, redoing moves them in the other direction.
        this.done = [];
        this.undone = [];
        this.undoDepth = Infinity;
        // Used to track when changes can be merged into a single undo
        // event
        this.lastModTime = this.lastSelTime = 0;
        this.lastOp = this.lastSelOp = null;
        this.lastOrigin = this.lastSelOrigin = null;
        // Used by the isClean() method
        this.generation = this.maxGeneration = startGen || 1;
      }

      // Create a history change event from an updateDoc-style change
      // object.
      function historyChangeFromChange(doc, change) {
        var histChange = {
          from: copyPos(change.from),
          to: changeEnd(change),
          text: getBetween(doc, change.from, change.to)
        };
        attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
        linkedDocs(doc, function(doc) {
          return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
        }, true);
        return histChange
      }

      // Pop all selection events off the end of a history array. Stop at
      // a change event.
      function clearSelectionEvents(array) {
        while (array.length) {
          var last = lst(array);
          if (last.ranges) {
            array.pop();
          } else {
            break
          }
        }
      }

      // Find the top change event in the history. Pop off selection
      // events that are in the way.
      function lastChangeEvent(hist, force) {
        if (force) {
          clearSelectionEvents(hist.done);
          return lst(hist.done)
        } else if (hist.done.length && !lst(hist.done).ranges) {
          return lst(hist.done)
        } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
          hist.done.pop();
          return lst(hist.done)
        }
      }

      // Register a change in the history. Merges changes that are within
      // a single operation, or are close together with an origin that
      // allows merging (starting with "+") into a single event.
      function addChangeToHistory(doc, change, selAfter, opId) {
        var hist = doc.history;
        hist.undone.length = 0;
        var time = +new Date,
          cur;
        var last;

        if ((hist.lastOp == opId ||
            hist.lastOrigin == change.origin && change.origin &&
            ((change.origin.charAt(0) == "+" && doc.cm && hist.lastModTime > time - doc.cm.options.historyEventDelay) ||
              change.origin.charAt(0) == "*")) &&
          (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
          // Merge this change into the last event
          last = lst(cur.changes);
          if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
            // Optimized case for simple insertion -- don't want to add
            // new changesets for every character typed
            last.to = changeEnd(change);
          } else {
            // Add new sub-event
            cur.changes.push(historyChangeFromChange(doc, change));
          }
        } else {
          // Can not be merged, start a new event.
          var before = lst(hist.done);
          if (!before || !before.ranges) {
            pushSelectionToHistory(doc.sel, hist.done);
          }
          cur = {
            changes: [historyChangeFromChange(doc, change)],
            generation: hist.generation
          };
          hist.done.push(cur);
          while (hist.done.length > hist.undoDepth) {
            hist.done.shift();
            if (!hist.done[0].ranges) {
              hist.done.shift();
            }
          }
        }
        hist.done.push(selAfter);
        hist.generation = ++hist.maxGeneration;
        hist.lastModTime = hist.lastSelTime = time;
        hist.lastOp = hist.lastSelOp = opId;
        hist.lastOrigin = hist.lastSelOrigin = change.origin;

        if (!last) {
          signal(doc, "historyAdded");
        }
      }

      function selectionEventCanBeMerged(doc, origin, prev, sel) {
        var ch = origin.charAt(0);
        return ch == "*" ||
          ch == "+" &&
          prev.ranges.length == sel.ranges.length &&
          prev.somethingSelected() == sel.somethingSelected() &&
          new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)
      }

      // Called whenever the selection changes, sets the new selection as
      // the pending selection in the history, and pushes the old pending
      // selection into the 'done' array when it was significantly
      // different (in number of selected ranges, emptiness, or time).
      function addSelectionToHistory(doc, sel, opId, options) {
        var hist = doc.history,
          origin = options && options.origin;

        // A new event is started when the previous origin does not match
        // the current, or the origins don't allow matching. Origins
        // starting with * are always merged, those starting with + are
        // merged when similar and close together in time.
        if (opId == hist.lastSelOp ||
          (origin && hist.lastSelOrigin == origin &&
            (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
              selectionEventCanBeMerged(doc, origin, lst(hist.done), sel)))) {
          hist.done[hist.done.length - 1] = sel;
        } else {
          pushSelectionToHistory(sel, hist.done);
        }

        hist.lastSelTime = +new Date;
        hist.lastSelOrigin = origin;
        hist.lastSelOp = opId;
        if (options && options.clearRedo !== false) {
          clearSelectionEvents(hist.undone);
        }
      }

      function pushSelectionToHistory(sel, dest) {
        var top = lst(dest);
        if (!(top && top.ranges && top.equals(sel))) {
          dest.push(sel);
        }
      }

      // Used to store marked span information in the history.
      function attachLocalSpans(doc, change, from, to) {
        var existing = change["spans_" + doc.id],
          n = 0;
        doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function(line) {
          if (line.markedSpans) {
            (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans;
          }
          ++n;
        });
      }

      // When un/re-doing restores text containing marked spans, those
      // that have been explicitly cleared should not be restored.
      function removeClearedSpans(spans) {
        if (!spans) {
          return null
        }
        var out;
        for (var i = 0; i < spans.length; ++i) {
          if (spans[i].marker.explicitlyCleared) {
            if (!out) {
              out = spans.slice(0, i);
            }
          } else if (out) {
            out.push(spans[i]);
          }
        }
        return !out ? spans : out.length ? out : null
      }

      // Retrieve and filter the old marked spans stored in a change event.
      function getOldSpans(doc, change) {
        var found = change["spans_" + doc.id];
        if (!found) {
          return null
        }
        var nw = [];
        for (var i = 0; i < change.text.length; ++i) {
          nw.push(removeClearedSpans(found[i]));
        }
        return nw
      }

      // Used for un/re-doing changes from the history. Combines the
      // result of computing the existing spans with the set of spans that
      // existed in the history (so that deleting around a span and then
      // undoing brings back the span).
      function mergeOldSpans(doc, change) {
        var old = getOldSpans(doc, change);
        var stretched = stretchSpansOverChange(doc, change);
        if (!old) {
          return stretched
        }
        if (!stretched) {
          return old
        }

        for (var i = 0; i < old.length; ++i) {
          var oldCur = old[i],
            stretchCur = stretched[i];
          if (oldCur && stretchCur) {
            spans: for (var j = 0; j < stretchCur.length; ++j) {
              var span = stretchCur[j];
              for (var k = 0; k < oldCur.length; ++k) {
                if (oldCur[k].marker == span.marker) {
                  continue spans
                }
              }
              oldCur.push(span);
            }
          }
          else if (stretchCur) {
            old[i] = stretchCur;
          }
        }
        return old
      }

      // Used both to provide a JSON-safe object in .getHistory, and, when
      // detaching a document, to split the history in two
      function copyHistoryArray(events, newGroup, instantiateSel) {
        var copy = [];
        for (var i = 0; i < events.length; ++i) {
          var event = events[i];
          if (event.ranges) {
            copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);
            continue
          }
          var changes = event.changes,
            newChanges = [];
          copy.push({
            changes: newChanges
          });
          for (var j = 0; j < changes.length; ++j) {
            var change = changes[j],
              m = (void 0);
            newChanges.push({
              from: change.from,
              to: change.to,
              text: change.text
            });
            if (newGroup) {
              for (var prop in change) {
                if (m = prop.match(/^spans_(\d+)$/)) {
                  if (indexOf(newGroup, Number(m[1])) > -1) {
                    lst(newChanges)[prop] = change[prop];
                    delete change[prop];
                  }
                }
              }
            }
          }
        }
        return copy
      }

      // The 'scroll' parameter given to many of these indicated whether
      // the new cursor position should be scrolled into view after
      // modifying the selection.

      // If shift is held or the extend flag is set, extends a range to
      // include a given position (and optionally a second position).
      // Otherwise, simply returns the range between the given positions.
      // Used for cursor motion and such.
      function extendRange(range, head, other, extend) {
        if (extend) {
          var anchor = range.anchor;
          if (other) {
            var posBefore = cmp(head, anchor) < 0;
            if (posBefore != (cmp(other, anchor) < 0)) {
              anchor = head;
              head = other;
            } else if (posBefore != (cmp(head, other) < 0)) {
              head = other;
            }
          }
          return new Range(anchor, head)
        } else {
          return new Range(other || head, head)
        }
      }

      // Extend the primary selection range, discard the rest.
      function extendSelection(doc, head, other, options, extend) {
        if (extend == null) {
          extend = doc.cm && (doc.cm.display.shift || doc.extend);
        }
        setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options);
      }

      // Extend all selections (pos is an array of selections with length
      // equal the number of selections)
      function extendSelections(doc, heads, options) {
        var out = [];
        var extend = doc.cm && (doc.cm.display.shift || doc.extend);
        for (var i = 0; i < doc.sel.ranges.length; i++) {
          out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend);
        }
        var newSel = normalizeSelection(out, doc.sel.primIndex);
        setSelection(doc, newSel, options);
      }

      // Updates a single range in the selection.
      function replaceOneSelection(doc, i, range, options) {
        var ranges = doc.sel.ranges.slice(0);
        ranges[i] = range;
        setSelection(doc, normalizeSelection(ranges, doc.sel.primIndex), options);
      }

      // Reset the selection to a single range.
      function setSimpleSelection(doc, anchor, head, options) {
        setSelection(doc, simpleSelection(anchor, head), options);
      }

      // Give beforeSelectionChange handlers a change to influence a
      // selection update.
      function filterSelectionChange(doc, sel, options) {
        var obj = {
          ranges: sel.ranges,
          update: function(ranges) {
            var this$1 = this;

            this.ranges = [];
            for (var i = 0; i < ranges.length; i++) {
              this$1.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
                clipPos(doc, ranges[i].head));
            }
          },
          origin: options && options.origin
        };
        signal(doc, "beforeSelectionChange", doc, obj);
        if (doc.cm) {
          signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
        }
        if (obj.ranges != sel.ranges) {
          return normalizeSelection(obj.ranges, obj.ranges.length - 1)
        } else {
          return sel
        }
      }

      function setSelectionReplaceHistory(doc, sel, options) {
        var done = doc.history.done,
          last = lst(done);
        if (last && last.ranges) {
          done[done.length - 1] = sel;
          setSelectionNoUndo(doc, sel, options);
        } else {
          setSelection(doc, sel, options);
        }
      }

      // Set a new selection.
      function setSelection(doc, sel, options) {
        setSelectionNoUndo(doc, sel, options);
        addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
      }

      function setSelectionNoUndo(doc, sel, options) {
        if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange")) {
          sel = filterSelectionChange(doc, sel, options);
        }

        var bias = options && options.bias ||
          (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
        setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));

        if (!(options && options.scroll === false) && doc.cm) {
          ensureCursorVisible(doc.cm);
        }
      }

      function setSelectionInner(doc, sel) {
        if (sel.equals(doc.sel)) {
          return
        }

        doc.sel = sel;

        if (doc.cm) {
          doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged = true;
          signalCursorActivity(doc.cm);
        }
        signalLater(doc, "cursorActivity", doc);
      }

      // Verify that the selection does not partially select any atomic
      // marked ranges.
      function reCheckSelection(doc) {
        setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false));
      }

      // Return a selection that does not partially select any atomic
      // ranges.
      function skipAtomicInSelection(doc, sel, bias, mayClear) {
        var out;
        for (var i = 0; i < sel.ranges.length; i++) {
          var range = sel.ranges[i];
          var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];
          var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear);
          var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear);
          if (out || newAnchor != range.anchor || newHead != range.head) {
            if (!out) {
              out = sel.ranges.slice(0, i);
            }
            out[i] = new Range(newAnchor, newHead);
          }
        }
        return out ? normalizeSelection(out, sel.primIndex) : sel
      }

      function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
        var line = getLine(doc, pos.line);
        if (line.markedSpans) {
          for (var i = 0; i < line.markedSpans.length; ++i) {
            var sp = line.markedSpans[i],
              m = sp.marker;
            if ((sp.from == null || (m.inclusiveLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
              (sp.to == null || (m.inclusiveRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
              if (mayClear) {
                signal(m, "beforeCursorEnter");
                if (m.explicitlyCleared) {
                  if (!line.markedSpans) {
                    break
                  } else {
                    --i;
                    continue
                  }
                }
              }
              if (!m.atomic) {
                continue
              }

              if (oldPos) {
                var near = m.find(dir < 0 ? 1 : -1),
                  diff = (void 0);
                if (dir < 0 ? m.inclusiveRight : m.inclusiveLeft) {
                  near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null);
                }
                if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0)) {
                  return skipAtomicInner(doc, near, pos, dir, mayClear)
                }
              }

              var far = m.find(dir < 0 ? -1 : 1);
              if (dir < 0 ? m.inclusiveLeft : m.inclusiveRight) {
                far = movePos(doc, far, dir, far.line == pos.line ? line : null);
              }
              return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null
            }
          }
        }
        return pos
      }

      // Ensure a given position is not inside an atomic range.
      function skipAtomic(doc, pos, oldPos, bias, mayClear) {
        var dir = bias || 1;
        var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
          (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
          skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
          (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));
        if (!found) {
          doc.cantEdit = true;
          return Pos(doc.first, 0)
        }
        return found
      }

      function movePos(doc, pos, dir, line) {
        if (dir < 0 && pos.ch == 0) {
          if (pos.line > doc.first) {
            return clipPos(doc, Pos(pos.line - 1))
          } else {
            return null
          }
        } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
          if (pos.line < doc.first + doc.size - 1) {
            return Pos(pos.line + 1, 0)
          } else {
            return null
          }
        } else {
          return new Pos(pos.line, pos.ch + dir)
        }
      }

      function selectAll(cm) {
        cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);
      }

      // UPDATING

      // Allow "beforeChange" event handlers to influence a change
      function filterChange(doc, change, update) {
        var obj = {
          canceled: false,
          from: change.from,
          to: change.to,
          text: change.text,
          origin: change.origin,
          cancel: function() {
            return obj.canceled = true;
          }
        };
        if (update) {
          obj.update = function(from, to, text, origin) {
            if (from) {
              obj.from = clipPos(doc, from);
            }
            if (to) {
              obj.to = clipPos(doc, to);
            }
            if (text) {
              obj.text = text;
            }
            if (origin !== undefined) {
              obj.origin = origin;
            }
          };
        }
        signal(doc, "beforeChange", doc, obj);
        if (doc.cm) {
          signal(doc.cm, "beforeChange", doc.cm, obj);
        }

        if (obj.canceled) {
          return null
        }
        return {
          from: obj.from,
          to: obj.to,
          text: obj.text,
          origin: obj.origin
        }
      }

      // Apply a change to a document, and add it to the document's
      // history, and propagating it to all linked documents.
      function makeChange(doc, change, ignoreReadOnly) {
        if (doc.cm) {
          if (!doc.cm.curOp) {
            return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly)
          }
          if (doc.cm.state.suppressEdits) {
            return
          }
        }

        if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
          change = filterChange(doc, change, true);
          if (!change) {
            return
          }
        }

        // Possibly split or suppress the update based on the presence
        // of read-only spans in its range.
        var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
        if (split) {
          for (var i = split.length - 1; i >= 0; --i) {
            makeChangeInner(doc, {
              from: split[i].from,
              to: split[i].to,
              text: i ? [""] : change.text,
              origin: change.origin
            });
          }
        } else {
          makeChangeInner(doc, change);
        }
      }

      function makeChangeInner(doc, change) {
        if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) {
          return
        }
        var selAfter = computeSelAfterChange(doc, change);
        addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);

        makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
        var rebased = [];

        linkedDocs(doc, function(doc, sharedHist) {
          if (!sharedHist && indexOf(rebased, doc.history) == -1) {
            rebaseHist(doc.history, change);
            rebased.push(doc.history);
          }
          makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
        });
      }

      // Revert a change stored in a document's history.
      function makeChangeFromHistory(doc, type, allowSelectionOnly) {
        var suppress = doc.cm && doc.cm.state.suppressEdits;
        if (suppress && !allowSelectionOnly) {
          return
        }

        var hist = doc.history,
          event, selAfter = doc.sel;
        var source = type == "undo" ? hist.done : hist.undone,
          dest = type == "undo" ? hist.undone : hist.done;

        // Verify that there is a useable event (so that ctrl-z won't
        // needlessly clear selection events)
        var i = 0;
        for (; i < source.length; i++) {
          event = source[i];
          if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges) {
            break
          }
        }
        if (i == source.length) {
          return
        }
        hist.lastOrigin = hist.lastSelOrigin = null;

        for (;;) {
          event = source.pop();
          if (event.ranges) {
            pushSelectionToHistory(event, dest);
            if (allowSelectionOnly && !event.equals(doc.sel)) {
              setSelection(doc, event, {
                clearRedo: false
              });
              return
            }
            selAfter = event;
          } else if (suppress) {
            source.push(event);
            return
          } else {
            break
          }
        }

        // Build up a reverse change object to add to the opposite history
        // stack (redo when undoing, and vice versa).
        var antiChanges = [];
        pushSelectionToHistory(selAfter, dest);
        dest.push({
          changes: antiChanges,
          generation: hist.generation
        });
        hist.generation = event.generation || ++hist.maxGeneration;

        var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");

        var loop = function(i) {
          var change = event.changes[i];
          change.origin = type;
          if (filter && !filterChange(doc, change, false)) {
            source.length = 0;
            return {}
          }

          antiChanges.push(historyChangeFromChange(doc, change));

          var after = i ? computeSelAfterChange(doc, change) : lst(source);
          makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
          if (!i && doc.cm) {
            doc.cm.scrollIntoView({
              from: change.from,
              to: changeEnd(change)
            });
          }
          var rebased = [];

          // Propagate to the linked documents
          linkedDocs(doc, function(doc, sharedHist) {
            if (!sharedHist && indexOf(rebased, doc.history) == -1) {
              rebaseHist(doc.history, change);
              rebased.push(doc.history);
            }
            makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
          });
        };

        for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {
          var returned = loop(i$1);

          if (returned) return returned.v;
        }
      }

      // Sub-views need their line numbers shifted when text is added
      // above or below them in the parent document.
      function shiftDoc(doc, distance) {
        if (distance == 0) {
          return
        }
        doc.first += distance;
        doc.sel = new Selection(map(doc.sel.ranges, function(range) {
          return new Range(
            Pos(range.anchor.line + distance, range.anchor.ch),
            Pos(range.head.line + distance, range.head.ch)
          );
        }), doc.sel.primIndex);
        if (doc.cm) {
          regChange(doc.cm, doc.first, doc.first - distance, distance);
          for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++) {
            regLineChange(doc.cm, l, "gutter");
          }
        }
      }

      // More lower-level change function, handling only a single document
      // (not linked ones).
      function makeChangeSingleDoc(doc, change, selAfter, spans) {
        if (doc.cm && !doc.cm.curOp) {
          return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans)
        }

        if (change.to.line < doc.first) {
          shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
          return
        }
        if (change.from.line > doc.lastLine()) {
          return
        }

        // Clip the change to the size of this doc
        if (change.from.line < doc.first) {
          var shift = change.text.length - 1 - (doc.first - change.from.line);
          shiftDoc(doc, shift);
          change = {
            from: Pos(doc.first, 0),
            to: Pos(change.to.line + shift, change.to.ch),
            text: [lst(change.text)],
            origin: change.origin
          };
        }
        var last = doc.lastLine();
        if (change.to.line > last) {
          change = {
            from: change.from,
            to: Pos(last, getLine(doc, last).text.length),
            text: [change.text[0]],
            origin: change.origin
          };
        }

        change.removed = getBetween(doc, change.from, change.to);

        if (!selAfter) {
          selAfter = computeSelAfterChange(doc, change);
        }
        if (doc.cm) {
          makeChangeSingleDocInEditor(doc.cm, change, spans);
        } else {
          updateDoc(doc, change, spans);
        }
        setSelectionNoUndo(doc, selAfter, sel_dontScroll);
      }

      // Handle the interaction of a change to a document with the editor
      // that this document is part of.
      function makeChangeSingleDocInEditor(cm, change, spans) {
        var doc = cm.doc,
          display = cm.display,
          from = change.from,
          to = change.to;

        var recomputeMaxLength = false,
          checkWidthStart = from.line;
        if (!cm.options.lineWrapping) {
          checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
          doc.iter(checkWidthStart, to.line + 1, function(line) {
            if (line == display.maxLine) {
              recomputeMaxLength = true;
              return true
            }
          });
        }

        if (doc.sel.contains(change.from, change.to) > -1) {
          signalCursorActivity(cm);
        }

        updateDoc(doc, change, spans, estimateHeight(cm));

        if (!cm.options.lineWrapping) {
          doc.iter(checkWidthStart, from.line + change.text.length, function(line) {
            var len = lineLength(line);
            if (len > display.maxLineLength) {
              display.maxLine = line;
              display.maxLineLength = len;
              display.maxLineChanged = true;
              recomputeMaxLength = false;
            }
          });
          if (recomputeMaxLength) {
            cm.curOp.updateMaxLine = true;
          }
        }

        retreatFrontier(doc, from.line);
        startWorker(cm, 400);

        var lendiff = change.text.length - (to.line - from.line) - 1;
        // Remember that these lines changed, for updating the display
        if (change.full) {
          regChange(cm);
        } else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change)) {
          regLineChange(cm, from.line, "text");
        } else {
          regChange(cm, from.line, to.line + 1, lendiff);
        }

        var changesHandler = hasHandler(cm, "changes"),
          changeHandler = hasHandler(cm, "change");
        if (changeHandler || changesHandler) {
          var obj = {
            from: from,
            to: to,
            text: change.text,
            removed: change.removed,
            origin: change.origin
          };
          if (changeHandler) {
            signalLater(cm, "change", cm, obj);
          }
          if (changesHandler) {
            (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj);
          }
        }
        cm.display.selForContextMenu = null;
      }

      function replaceRange(doc, code, from, to, origin) {
        if (!to) {
          to = from;
        }
        if (cmp(to, from) < 0) {
          var assign;
          (assign = [to, from], from = assign[0], to = assign[1], assign);
        }
        if (typeof code == "string") {
          code = doc.splitLines(code);
        }
        makeChange(doc, {
          from: from,
          to: to,
          text: code,
          origin: origin
        });
      }

      // Rebasing/resetting history to deal with externally-sourced changes

      function rebaseHistSelSingle(pos, from, to, diff) {
        if (to < pos.line) {
          pos.line += diff;
        } else if (from < pos.line) {
          pos.line = from;
          pos.ch = 0;
        }
      }

      // Tries to rebase an array of history events given a change in the
      // document. If the change touches the same lines as the event, the
      // event, and everything 'behind' it, is discarded. If the change is
      // before the event, the event's positions are updated. Uses a
      // copy-on-write scheme for the positions, to avoid having to
      // reallocate them all on every rebase, but also avoid problems with
      // shared position objects being unsafely updated.
      function rebaseHistArray(array, from, to, diff) {
        for (var i = 0; i < array.length; ++i) {
          var sub = array[i],
            ok = true;
          if (sub.ranges) {
            if (!sub.copied) {
              sub = array[i] = sub.deepCopy();
              sub.copied = true;
            }
            for (var j = 0; j < sub.ranges.length; j++) {
              rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
              rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
            }
            continue
          }
          for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {
            var cur = sub.changes[j$1];
            if (to < cur.from.line) {
              cur.from = Pos(cur.from.line + diff, cur.from.ch);
              cur.to = Pos(cur.to.line + diff, cur.to.ch);
            } else if (from <= cur.to.line) {
              ok = false;
              break
            }
          }
          if (!ok) {
            array.splice(0, i + 1);
            i = 0;
          }
        }
      }

      function rebaseHist(hist, change) {
        var from = change.from.line,
          to = change.to.line,
          diff = change.text.length - (to - from) - 1;
        rebaseHistArray(hist.done, from, to, diff);
        rebaseHistArray(hist.undone, from, to, diff);
      }

      // Utility for applying a change to a line by handle or number,
      // returning the number and optionally registering the line as
      // changed.
      function changeLine(doc, handle, changeType, op) {
        var no = handle,
          line = handle;
        if (typeof handle == "number") {
          line = getLine(doc, clipLine(doc, handle));
        } else {
          no = lineNo(handle);
        }
        if (no == null) {
          return null
        }
        if (op(line, no) && doc.cm) {
          regLineChange(doc.cm, no, changeType);
        }
        return line
      }

      // The document is represented as a BTree consisting of leaves, with
      // chunk of lines in them, and branches, with up to ten leaves or
      // other branch nodes below them. The top node is always a branch
      // node, and is the document object itself (meaning it has
      // additional methods and properties).
      //
      // All nodes have parent links. The tree is used both to go from
      // line numbers to line objects, and to go from objects to numbers.
      // It also indexes by height, and is used to convert between height
      // and line object, and to find the total height of the document.
      //
      // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html

      function LeafChunk(lines) {
        var this$1 = this;

        this.lines = lines;
        this.parent = null;
        var height = 0;
        for (var i = 0; i < lines.length; ++i) {
          lines[i].parent = this$1;
          height += lines[i].height;
        }
        this.height = height;
      }

      LeafChunk.prototype = {
        chunkSize: function chunkSize() {
          return this.lines.length
        },

        // Remove the n lines at offset 'at'.
        removeInner: function removeInner(at, n) {
          var this$1 = this;

          for (var i = at, e = at + n; i < e; ++i) {
            var line = this$1.lines[i];
            this$1.height -= line.height;
            cleanUpLine(line);
            signalLater(line, "delete");
          }
          this.lines.splice(at, n);
        },

        // Helper used to collapse a small branch into a single leaf.
        collapse: function collapse(lines) {
          lines.push.apply(lines, this.lines);
        },

        // Insert the given array of lines at offset 'at', count them as
        // having the given height.
        insertInner: function insertInner(at, lines, height) {
          var this$1 = this;

          this.height += height;
          this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
          for (var i = 0; i < lines.length; ++i) {
            lines[i].parent = this$1;
          }
        },

        // Used to iterate over a part of the tree.
        iterN: function iterN(at, n, op) {
          var this$1 = this;

          for (var e = at + n; at < e; ++at) {
            if (op(this$1.lines[at])) {
              return true
            }
          }
        }
      };

      function BranchChunk(children) {
        var this$1 = this;

        this.children = children;
        var size = 0,
          height = 0;
        for (var i = 0; i < children.length; ++i) {
          var ch = children[i];
          size += ch.chunkSize();
          height += ch.height;
          ch.parent = this$1;
        }
        this.size = size;
        this.height = height;
        this.parent = null;
      }

      BranchChunk.prototype = {
        chunkSize: function chunkSize() {
          return this.size
        },

        removeInner: function removeInner(at, n) {
          var this$1 = this;

          this.size -= n;
          for (var i = 0; i < this.children.length; ++i) {
            var child = this$1.children[i],
              sz = child.chunkSize();
            if (at < sz) {
              var rm = Math.min(n, sz - at),
                oldHeight = child.height;
              child.removeInner(at, rm);
              this$1.height -= oldHeight - child.height;
              if (sz == rm) {
                this$1.children.splice(i--, 1);
                child.parent = null;
              }
              if ((n -= rm) == 0) {
                break
              }
              at = 0;
            } else {
              at -= sz;
            }
          }
          // If the result is smaller than 25 lines, ensure that it is a
          // single leaf node.
          if (this.size - n < 25 &&
            (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
            var lines = [];
            this.collapse(lines);
            this.children = [new LeafChunk(lines)];
            this.children[0].parent = this;
          }
        },

        collapse: function collapse(lines) {
          var this$1 = this;

          for (var i = 0; i < this.children.length; ++i) {
            this$1.children[i].collapse(lines);
          }
        },

        insertInner: function insertInner(at, lines, height) {
          var this$1 = this;

          this.size += lines.length;
          this.height += height;
          for (var i = 0; i < this.children.length; ++i) {
            var child = this$1.children[i],
              sz = child.chunkSize();
            if (at <= sz) {
              child.insertInner(at, lines, height);
              if (child.lines && child.lines.length > 50) {
                // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
                // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
                var remaining = child.lines.length % 25 + 25;
                for (var pos = remaining; pos < child.lines.length;) {
                  var leaf = new LeafChunk(child.lines.slice(pos, pos += 25));
                  child.height -= leaf.height;
                  this$1.children.splice(++i, 0, leaf);
                  leaf.parent = this$1;
                }
                child.lines = child.lines.slice(0, remaining);
                this$1.maybeSpill();
              }
              break
            }
            at -= sz;
          }
        },

        // When a node has grown, check whether it should be split.
        maybeSpill: function maybeSpill() {
          if (this.children.length <= 10) {
            return
          }
          var me = this;
          do {
            var spilled = me.children.splice(me.children.length - 5, 5);
            var sibling = new BranchChunk(spilled);
            if (!me.parent) { // Become the parent node
              var copy = new BranchChunk(me.children);
              copy.parent = me;
              me.children = [copy, sibling];
              me = copy;
            } else {
              me.size -= sibling.size;
              me.height -= sibling.height;
              var myIndex = indexOf(me.parent.children, me);
              me.parent.children.splice(myIndex + 1, 0, sibling);
            }
            sibling.parent = me.parent;
          } while (me.children.length > 10)
          me.parent.maybeSpill();
        },

        iterN: function iterN(at, n, op) {
          var this$1 = this;

          for (var i = 0; i < this.children.length; ++i) {
            var child = this$1.children[i],
              sz = child.chunkSize();
            if (at < sz) {
              var used = Math.min(n, sz - at);
              if (child.iterN(at, used, op)) {
                return true
              }
              if ((n -= used) == 0) {
                break
              }
              at = 0;
            } else {
              at -= sz;
            }
          }
        }
      };

      // Line widgets are block elements displayed above or below a line.

      var LineWidget = function(doc, node, options) {
        var this$1 = this;

        if (options) {
          for (var opt in options) {
            if (options.hasOwnProperty(opt)) {
              this$1[opt] = options[opt];
            }
          }
        }
        this.doc = doc;
        this.node = node;
      };

      LineWidget.prototype.clear = function() {
        var this$1 = this;

        var cm = this.doc.cm,
          ws = this.line.widgets,
          line = this.line,
          no = lineNo(line);
        if (no == null || !ws) {
          return
        }
        for (var i = 0; i < ws.length; ++i) {
          if (ws[i] == this$1) {
            ws.splice(i--, 1);
          }
        }
        if (!ws.length) {
          line.widgets = null;
        }
        var height = widgetHeight(this);
        updateLineHeight(line, Math.max(0, line.height - height));
        if (cm) {
          runInOp(cm, function() {
            adjustScrollWhenAboveVisible(cm, line, -height);
            regLineChange(cm, no, "widget");
          });
          signalLater(cm, "lineWidgetCleared", cm, this, no);
        }
      };

      LineWidget.prototype.changed = function() {
        var this$1 = this;

        var oldH = this.height,
          cm = this.doc.cm,
          line = this.line;
        this.height = null;
        var diff = widgetHeight(this) - oldH;
        if (!diff) {
          return
        }
        updateLineHeight(line, line.height + diff);
        if (cm) {
          runInOp(cm, function() {
            cm.curOp.forceUpdate = true;
            adjustScrollWhenAboveVisible(cm, line, diff);
            signalLater(cm, "lineWidgetChanged", cm, this$1, lineNo(line));
          });
        }
      };
      eventMixin(LineWidget);

      function adjustScrollWhenAboveVisible(cm, line, diff) {
        if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop)) {
          addToScrollTop(cm, diff);
        }
      }

      function addLineWidget(doc, handle, node, options) {
        var widget = new LineWidget(doc, node, options);
        var cm = doc.cm;
        if (cm && widget.noHScroll) {
          cm.display.alignWidgets = true;
        }
        changeLine(doc, handle, "widget", function(line) {
          var widgets = line.widgets || (line.widgets = []);
          if (widget.insertAt == null) {
            widgets.push(widget);
          } else {
            widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget);
          }
          widget.line = line;
          if (cm && !lineIsHidden(doc, line)) {
            var aboveVisible = heightAtLine(line) < doc.scrollTop;
            updateLineHeight(line, line.height + widgetHeight(widget));
            if (aboveVisible) {
              addToScrollTop(cm, widget.height);
            }
            cm.curOp.forceUpdate = true;
          }
          return true
        });
        if (cm) {
          signalLater(cm, "lineWidgetAdded", cm, widget, typeof handle == "number" ? handle : lineNo(handle));
        }
        return widget
      }

      // TEXTMARKERS

      // Created with markText and setBookmark methods. A TextMarker is a
      // handle that can be used to clear or find a marked position in the
      // document. Line objects hold arrays (markedSpans) containing
      // {from, to, marker} object pointing to such marker objects, and
      // indicating that such a marker is present on that line. Multiple
      // lines may point to the same marker when it spans across lines.
      // The spans will have null for their from/to properties when the
      // marker continues beyond the start/end of the line. Markers have
      // links back to the lines they currently touch.

      // Collapsed markers have unique ids, in order to be able to order
      // them, which is needed for uniquely determining an outer marker
      // when they overlap (they may nest, but not partially overlap).
      var nextMarkerId = 0;

      var TextMarker = function(doc, type) {
        this.lines = [];
        this.type = type;
        this.doc = doc;
        this.id = ++nextMarkerId;
      };

      // Clear the marker.
      TextMarker.prototype.clear = function() {
        var this$1 = this;

        if (this.explicitlyCleared) {
          return
        }
        var cm = this.doc.cm,
          withOp = cm && !cm.curOp;
        if (withOp) {
          startOperation(cm);
        }
        if (hasHandler(this, "clear")) {
          var found = this.find();
          if (found) {
            signalLater(this, "clear", found.from, found.to);
          }
        }
        var min = null,
          max = null;
        for (var i = 0; i < this.lines.length; ++i) {
          var line = this$1.lines[i];
          var span = getMarkedSpanFor(line.markedSpans, this$1);
          if (cm && !this$1.collapsed) {
            regLineChange(cm, lineNo(line), "text");
          } else if (cm) {
            if (span.to != null) {
              max = lineNo(line);
            }
            if (span.from != null) {
              min = lineNo(line);
            }
          }
          line.markedSpans = removeMarkedSpan(line.markedSpans, span);
          if (span.from == null && this$1.collapsed && !lineIsHidden(this$1.doc, line) && cm) {
            updateLineHeight(line, textHeight(cm.display));
          }
        }
        if (cm && this.collapsed && !cm.options.lineWrapping) {
          for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {
            var visual = visualLine(this$1.lines[i$1]),
              len = lineLength(visual);
            if (len > cm.display.maxLineLength) {
              cm.display.maxLine = visual;
              cm.display.maxLineLength = len;
              cm.display.maxLineChanged = true;
            }
          }
        }

        if (min != null && cm && this.collapsed) {
          regChange(cm, min, max + 1);
        }
        this.lines.length = 0;
        this.explicitlyCleared = true;
        if (this.atomic && this.doc.cantEdit) {
          this.doc.cantEdit = false;
          if (cm) {
            reCheckSelection(cm.doc);
          }
        }
        if (cm) {
          signalLater(cm, "markerCleared", cm, this, min, max);
        }
        if (withOp) {
          endOperation(cm);
        }
        if (this.parent) {
          this.parent.clear();
        }
      };

      // Find the position of the marker in the document. Returns a {from,
      // to} object by default. Side can be passed to get a specific side
      // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
      // Pos objects returned contain a line object, rather than a line
      // number (used to prevent looking up the same line twice).
      TextMarker.prototype.find = function(side, lineObj) {
        var this$1 = this;

        if (side == null && this.type == "bookmark") {
          side = 1;
        }
        var from, to;
        for (var i = 0; i < this.lines.length; ++i) {
          var line = this$1.lines[i];
          var span = getMarkedSpanFor(line.markedSpans, this$1);
          if (span.from != null) {
            from = Pos(lineObj ? line : lineNo(line), span.from);
            if (side == -1) {
              return from
            }
          }
          if (span.to != null) {
            to = Pos(lineObj ? line : lineNo(line), span.to);
            if (side == 1) {
              return to
            }
          }
        }
        return from && {
          from: from,
          to: to
        }
      };

      // Signals that the marker's widget changed, and surrounding layout
      // should be recomputed.
      TextMarker.prototype.changed = function() {
        var this$1 = this;

        var pos = this.find(-1, true),
          widget = this,
          cm = this.doc.cm;
        if (!pos || !cm) {
          return
        }
        runInOp(cm, function() {
          var line = pos.line,
            lineN = lineNo(pos.line);
          var view = findViewForLine(cm, lineN);
          if (view) {
            clearLineMeasurementCacheFor(view);
            cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
          }
          cm.curOp.updateMaxLine = true;
          if (!lineIsHidden(widget.doc, line) && widget.height != null) {
            var oldHeight = widget.height;
            widget.height = null;
            var dHeight = widgetHeight(widget) - oldHeight;
            if (dHeight) {
              updateLineHeight(line, line.height + dHeight);
            }
          }
          signalLater(cm, "markerChanged", cm, this$1);
        });
      };

      TextMarker.prototype.attachLine = function(line) {
        if (!this.lines.length && this.doc.cm) {
          var op = this.doc.cm.curOp;
          if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1) {
            (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this);
          }
        }
        this.lines.push(line);
      };

      TextMarker.prototype.detachLine = function(line) {
        this.lines.splice(indexOf(this.lines, line), 1);
        if (!this.lines.length && this.doc.cm) {
          var op = this.doc.cm.curOp;
          (op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
        }
      };
      eventMixin(TextMarker);

      // Create a marker, wire it up to the right lines, and
      function markText(doc, from, to, options, type) {
        // Shared markers (across linked documents) are handled separately
        // (markTextShared will call out to this again, once per
        // document).
        if (options && options.shared) {
          return markTextShared(doc, from, to, options, type)
        }
        // Ensure we are in an operation.
        if (doc.cm && !doc.cm.curOp) {
          return operation(doc.cm, markText)(doc, from, to, options, type)
        }

        var marker = new TextMarker(doc, type),
          diff = cmp(from, to);
        if (options) {
          copyObj(options, marker, false);
        }
        // Don't connect empty markers unless clearWhenEmpty is false
        if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false) {
          return marker
        }
        if (marker.replacedWith) {
          // Showing up as a widget implies collapsed (widget replaces text)
          marker.collapsed = true;
          marker.widgetNode = eltP("span", [marker.replacedWith], "CodeMirror-widget");
          if (!options.handleMouseEvents) {
            marker.widgetNode.setAttribute("cm-ignore-events", "true");
          }
          if (options.insertLeft) {
            marker.widgetNode.insertLeft = true;
          }
        }
        if (marker.collapsed) {
          if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
            from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker)) {
            throw new Error("Inserting collapsed marker partially overlapping an existing one")
          }
          seeCollapsedSpans();
        }

        if (marker.addToHistory) {
          addChangeToHistory(doc, {
            from: from,
            to: to,
            origin: "markText"
          }, doc.sel, NaN);
        }

        var curLine = from.line,
          cm = doc.cm,
          updateMaxLine;
        doc.iter(curLine, to.line + 1, function(line) {
          if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine) {
            updateMaxLine = true;
          }
          if (marker.collapsed && curLine != from.line) {
            updateLineHeight(line, 0);
          }
          addMarkedSpan(line, new MarkedSpan(marker,
            curLine == from.line ? from.ch : null,
            curLine == to.line ? to.ch : null));
          ++curLine;
        });
        // lineIsHidden depends on the presence of the spans, so needs a second pass
        if (marker.collapsed) {
          doc.iter(from.line, to.line + 1, function(line) {
            if (lineIsHidden(doc, line)) {
              updateLineHeight(line, 0);
            }
          });
        }

        if (marker.clearOnEnter) {
          on(marker, "beforeCursorEnter", function() {
            return marker.clear();
          });
        }

        if (marker.readOnly) {
          seeReadOnlySpans();
          if (doc.history.done.length || doc.history.undone.length) {
            doc.clearHistory();
          }
        }
        if (marker.collapsed) {
          marker.id = ++nextMarkerId;
          marker.atomic = true;
        }
        if (cm) {
          // Sync editor state
          if (updateMaxLine) {
            cm.curOp.updateMaxLine = true;
          }
          if (marker.collapsed) {
            regChange(cm, from.line, to.line + 1);
          } else if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.css) {
            for (var i = from.line; i <= to.line; i++) {
              regLineChange(cm, i, "text");
            }
          }
          if (marker.atomic) {
            reCheckSelection(cm.doc);
          }
          signalLater(cm, "markerAdded", cm, marker);
        }
        return marker
      }

      // SHARED TEXTMARKERS

      // A shared marker spans multiple linked documents. It is
      // implemented as a meta-marker-object controlling multiple normal
      // markers.
      var SharedTextMarker = function(markers, primary) {
        var this$1 = this;

        this.markers = markers;
        this.primary = primary;
        for (var i = 0; i < markers.length; ++i) {
          markers[i].parent = this$1;
        }
      };

      SharedTextMarker.prototype.clear = function() {
        var this$1 = this;

        if (this.explicitlyCleared) {
          return
        }
        this.explicitlyCleared = true;
        for (var i = 0; i < this.markers.length; ++i) {
          this$1.markers[i].clear();
        }
        signalLater(this, "clear");
      };

      SharedTextMarker.prototype.find = function(side, lineObj) {
        return this.primary.find(side, lineObj)
      };
      eventMixin(SharedTextMarker);

      function markTextShared(doc, from, to, options, type) {
        options = copyObj(options);
        options.shared = false;
        var markers = [markText(doc, from, to, options, type)],
          primary = markers[0];
        var widget = options.widgetNode;
        linkedDocs(doc, function(doc) {
          if (widget) {
            options.widgetNode = widget.cloneNode(true);
          }
          markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
          for (var i = 0; i < doc.linked.length; ++i) {
            if (doc.linked[i].isParent) {
              return
            }
          }
          primary = lst(markers);
        });
        return new SharedTextMarker(markers, primary)
      }

      function findSharedMarkers(doc) {
        return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function(m) {
          return m.parent;
        })
      }

      function copySharedMarkers(doc, markers) {
        for (var i = 0; i < markers.length; i++) {
          var marker = markers[i],
            pos = marker.find();
          var mFrom = doc.clipPos(pos.from),
            mTo = doc.clipPos(pos.to);
          if (cmp(mFrom, mTo)) {
            var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);
            marker.markers.push(subMark);
            subMark.parent = marker;
          }
        }
      }

      function detachSharedMarkers(markers) {
        var loop = function(i) {
          var marker = markers[i],
            linked = [marker.primary.doc];
          linkedDocs(marker.primary.doc, function(d) {
            return linked.push(d);
          });
          for (var j = 0; j < marker.markers.length; j++) {
            var subMarker = marker.markers[j];
            if (indexOf(linked, subMarker.doc) == -1) {
              subMarker.parent = null;
              marker.markers.splice(j--, 1);
            }
          }
        };

        for (var i = 0; i < markers.length; i++) loop(i);
      }

      var nextDocId = 0;
      var Doc = function(text, mode, firstLine, lineSep, direction) {
        if (!(this instanceof Doc)) {
          return new Doc(text, mode, firstLine, lineSep, direction)
        }
        if (firstLine == null) {
          firstLine = 0;
        }

        BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
        this.first = firstLine;
        this.scrollTop = this.scrollLeft = 0;
        this.cantEdit = false;
        this.cleanGeneration = 1;
        this.modeFrontier = this.highlightFrontier = firstLine;
        var start = Pos(firstLine, 0);
        this.sel = simpleSelection(start);
        this.history = new History(null);
        this.id = ++nextDocId;
        this.modeOption = mode;
        this.lineSep = lineSep;
        this.direction = (direction == "rtl") ? "rtl" : "ltr";
        this.extend = false;

        if (typeof text == "string") {
          text = this.splitLines(text);
        }
        updateDoc(this, {
          from: start,
          to: start,
          text: text
        });
        setSelection(this, simpleSelection(start), sel_dontScroll);
      };

      Doc.prototype = createObj(BranchChunk.prototype, {
        constructor: Doc,
        // Iterate over the document. Supports two forms -- with only one
        // argument, it calls that for each line in the document. With
        // three, it iterates over the range given by the first two (with
        // the second being non-inclusive).
        iter: function(from, to, op) {
          if (op) {
            this.iterN(from - this.first, to - from, op);
          } else {
            this.iterN(this.first, this.first + this.size, from);
          }
        },

        // Non-public interface for adding and removing lines.
        insert: function(at, lines) {
          var height = 0;
          for (var i = 0; i < lines.length; ++i) {
            height += lines[i].height;
          }
          this.insertInner(at - this.first, lines, height);
        },
        remove: function(at, n) {
          this.removeInner(at - this.first, n);
        },

        // From here, the methods are part of the public interface. Most
        // are also available from CodeMirror (editor) instances.

        getValue: function(lineSep) {
          var lines = getLines(this, this.first, this.first + this.size);
          if (lineSep === false) {
            return lines
          }
          return lines.join(lineSep || this.lineSeparator())
        },
        setValue: docMethodOp(function(code) {
          var top = Pos(this.first, 0),
            last = this.first + this.size - 1;
          makeChange(this, {
            from: top,
            to: Pos(last, getLine(this, last).text.length),
            text: this.splitLines(code),
            origin: "setValue",
            full: true
          }, true);
          if (this.cm) {
            scrollToCoords(this.cm, 0, 0);
          }
          setSelection(this, simpleSelection(top), sel_dontScroll);
        }),
        replaceRange: function(code, from, to, origin) {
          from = clipPos(this, from);
          to = to ? clipPos(this, to) : from;
          replaceRange(this, code, from, to, origin);
        },
        getRange: function(from, to, lineSep) {
          var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
          if (lineSep === false) {
            return lines
          }
          return lines.join(lineSep || this.lineSeparator())
        },

        getLine: function(line) {
          var l = this.getLineHandle(line);
          return l && l.text
        },

        getLineHandle: function(line) {
          if (isLine(this, line)) {
            return getLine(this, line)
          }
        },
        getLineNumber: function(line) {
          return lineNo(line)
        },

        getLineHandleVisualStart: function(line) {
          if (typeof line == "number") {
            line = getLine(this, line);
          }
          return visualLine(line)
        },

        lineCount: function() {
          return this.size
        },
        firstLine: function() {
          return this.first
        },
        lastLine: function() {
          return this.first + this.size - 1
        },

        clipPos: function(pos) {
          return clipPos(this, pos)
        },

        getCursor: function(start) {
          var range$$1 = this.sel.primary(),
            pos;
          if (start == null || start == "head") {
            pos = range$$1.head;
          } else if (start == "anchor") {
            pos = range$$1.anchor;
          } else if (start == "end" || start == "to" || start === false) {
            pos = range$$1.to();
          } else {
            pos = range$$1.from();
          }
          return pos
        },
        listSelections: function() {
          return this.sel.ranges
        },
        somethingSelected: function() {
          return this.sel.somethingSelected()
        },

        setCursor: docMethodOp(function(line, ch, options) {
          setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options);
        }),
        setSelection: docMethodOp(function(anchor, head, options) {
          setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
        }),
        extendSelection: docMethodOp(function(head, other, options) {
          extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
        }),
        extendSelections: docMethodOp(function(heads, options) {
          extendSelections(this, clipPosArray(this, heads), options);
        }),
        extendSelectionsBy: docMethodOp(function(f, options) {
          var heads = map(this.sel.ranges, f);
          extendSelections(this, clipPosArray(this, heads), options);
        }),
        setSelections: docMethodOp(function(ranges, primary, options) {
          var this$1 = this;

          if (!ranges.length) {
            return
          }
          var out = [];
          for (var i = 0; i < ranges.length; i++) {
            out[i] = new Range(clipPos(this$1, ranges[i].anchor),
              clipPos(this$1, ranges[i].head));
          }
          if (primary == null) {
            primary = Math.min(ranges.length - 1, this.sel.primIndex);
          }
          setSelection(this, normalizeSelection(out, primary), options);
        }),
        addSelection: docMethodOp(function(anchor, head, options) {
          var ranges = this.sel.ranges.slice(0);
          ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
          setSelection(this, normalizeSelection(ranges, ranges.length - 1), options);
        }),

        getSelection: function(lineSep) {
          var this$1 = this;

          var ranges = this.sel.ranges,
            lines;
          for (var i = 0; i < ranges.length; i++) {
            var sel = getBetween(this$1, ranges[i].from(), ranges[i].to());
            lines = lines ? lines.concat(sel) : sel;
          }
          if (lineSep === false) {
            return lines
          } else {
            return lines.join(lineSep || this.lineSeparator())
          }
        },
        getSelections: function(lineSep) {
          var this$1 = this;

          var parts = [],
            ranges = this.sel.ranges;
          for (var i = 0; i < ranges.length; i++) {
            var sel = getBetween(this$1, ranges[i].from(), ranges[i].to());
            if (lineSep !== false) {
              sel = sel.join(lineSep || this$1.lineSeparator());
            }
            parts[i] = sel;
          }
          return parts
        },
        replaceSelection: function(code, collapse, origin) {
          var dup = [];
          for (var i = 0; i < this.sel.ranges.length; i++) {
            dup[i] = code;
          }
          this.replaceSelections(dup, collapse, origin || "+input");
        },
        replaceSelections: docMethodOp(function(code, collapse, origin) {
          var this$1 = this;

          var changes = [],
            sel = this.sel;
          for (var i = 0; i < sel.ranges.length; i++) {
            var range$$1 = sel.ranges[i];
            changes[i] = {
              from: range$$1.from(),
              to: range$$1.to(),
              text: this$1.splitLines(code[i]),
              origin: origin
            };
          }
          var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
          for (var i$1 = changes.length - 1; i$1 >= 0; i$1--) {
            makeChange(this$1, changes[i$1]);
          }
          if (newSel) {
            setSelectionReplaceHistory(this, newSel);
          } else if (this.cm) {
            ensureCursorVisible(this.cm);
          }
        }),
        undo: docMethodOp(function() {
          makeChangeFromHistory(this, "undo");
        }),
        redo: docMethodOp(function() {
          makeChangeFromHistory(this, "redo");
        }),
        undoSelection: docMethodOp(function() {
          makeChangeFromHistory(this, "undo", true);
        }),
        redoSelection: docMethodOp(function() {
          makeChangeFromHistory(this, "redo", true);
        }),

        setExtending: function(val) {
          this.extend = val;
        },
        getExtending: function() {
          return this.extend
        },

        historySize: function() {
          var hist = this.history,
            done = 0,
            undone = 0;
          for (var i = 0; i < hist.done.length; i++) {
            if (!hist.done[i].ranges) {
              ++done;
            }
          }
          for (var i$1 = 0; i$1 < hist.undone.length; i$1++) {
            if (!hist.undone[i$1].ranges) {
              ++undone;
            }
          }
          return {
            undo: done,
            redo: undone
          }
        },
        clearHistory: function() {
          this.history = new History(this.history.maxGeneration);
        },

        markClean: function() {
          this.cleanGeneration = this.changeGeneration(true);
        },
        changeGeneration: function(forceSplit) {
          if (forceSplit) {
            this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null;
          }
          return this.history.generation
        },
        isClean: function(gen) {
          return this.history.generation == (gen || this.cleanGeneration)
        },

        getHistory: function() {
          return {
            done: copyHistoryArray(this.history.done),
            undone: copyHistoryArray(this.history.undone)
          }
        },
        setHistory: function(histData) {
          var hist = this.history = new History(this.history.maxGeneration);
          hist.done = copyHistoryArray(histData.done.slice(0), null, true);
          hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
        },

        setGutterMarker: docMethodOp(function(line, gutterID, value) {
          return changeLine(this, line, "gutter", function(line) {
            var markers = line.gutterMarkers || (line.gutterMarkers = {});
            markers[gutterID] = value;
            if (!value && isEmpty(markers)) {
              line.gutterMarkers = null;
            }
            return true
          })
        }),

        clearGutter: docMethodOp(function(gutterID) {
          var this$1 = this;

          this.iter(function(line) {
            if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
              changeLine(this$1, line, "gutter", function() {
                line.gutterMarkers[gutterID] = null;
                if (isEmpty(line.gutterMarkers)) {
                  line.gutterMarkers = null;
                }
                return true
              });
            }
          });
        }),

        lineInfo: function(line) {
          var n;
          if (typeof line == "number") {
            if (!isLine(this, line)) {
              return null
            }
            n = line;
            line = getLine(this, line);
            if (!line) {
              return null
            }
          } else {
            n = lineNo(line);
            if (n == null) {
              return null
            }
          }
          return {
            line: n,
            handle: line,
            text: line.text,
            gutterMarkers: line.gutterMarkers,
            textClass: line.textClass,
            bgClass: line.bgClass,
            wrapClass: line.wrapClass,
            widgets: line.widgets
          }
        },

        addLineClass: docMethodOp(function(handle, where, cls) {
          return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function(line) {
            var prop = where == "text" ? "textClass" :
              where == "background" ? "bgClass" :
              where == "gutter" ? "gutterClass" : "wrapClass";
            if (!line[prop]) {
              line[prop] = cls;
            } else if (classTest(cls).test(line[prop])) {
              return false
            } else {
              line[prop] += " " + cls;
            }
            return true
          })
        }),
        removeLineClass: docMethodOp(function(handle, where, cls) {
          return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function(line) {
            var prop = where == "text" ? "textClass" :
              where == "background" ? "bgClass" :
              where == "gutter" ? "gutterClass" : "wrapClass";
            var cur = line[prop];
            if (!cur) {
              return false
            } else if (cls == null) {
              line[prop] = null;
            } else {
              var found = cur.match(classTest(cls));
              if (!found) {
                return false
              }
              var end = found.index + found[0].length;
              line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
            }
            return true
          })
        }),

        addLineWidget: docMethodOp(function(handle, node, options) {
          return addLineWidget(this, handle, node, options)
        }),
        removeLineWidget: function(widget) {
          widget.clear();
        },

        markText: function(from, to, options) {
          return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range")
        },
        setBookmark: function(pos, options) {
          var realOpts = {
            replacedWith: options && (options.nodeType == null ? options.widget : options),
            insertLeft: options && options.insertLeft,
            clearWhenEmpty: false,
            shared: options && options.shared,
            handleMouseEvents: options && options.handleMouseEvents
          };
          pos = clipPos(this, pos);
          return markText(this, pos, pos, realOpts, "bookmark")
        },
        findMarksAt: function(pos) {
          pos = clipPos(this, pos);
          var markers = [],
            spans = getLine(this, pos.line).markedSpans;
          if (spans) {
            for (var i = 0; i < spans.length; ++i) {
              var span = spans[i];
              if ((span.from == null || span.from <= pos.ch) &&
                (span.to == null || span.to >= pos.ch)) {
                markers.push(span.marker.parent || span.marker);
              }
            }
          }
          return markers
        },
        findMarks: function(from, to, filter) {
          from = clipPos(this, from);
          to = clipPos(this, to);
          var found = [],
            lineNo$$1 = from.line;
          this.iter(from.line, to.line + 1, function(line) {
            var spans = line.markedSpans;
            if (spans) {
              for (var i = 0; i < spans.length; i++) {
                var span = spans[i];
                if (!(span.to != null && lineNo$$1 == from.line && from.ch >= span.to ||
                    span.from == null && lineNo$$1 != from.line ||
                    span.from != null && lineNo$$1 == to.line && span.from >= to.ch) &&
                  (!filter || filter(span.marker))) {
                  found.push(span.marker.parent || span.marker);
                }
              }
            }
            ++lineNo$$1;
          });
          return found
        },
        getAllMarks: function() {
          var markers = [];
          this.iter(function(line) {
            var sps = line.markedSpans;
            if (sps) {
              for (var i = 0; i < sps.length; ++i) {
                if (sps[i].from != null) {
                  markers.push(sps[i].marker);
                }
              }
            }
          });
          return markers
        },

        posFromIndex: function(off) {
          var ch, lineNo$$1 = this.first,
            sepSize = this.lineSeparator().length;
          this.iter(function(line) {
            var sz = line.text.length + sepSize;
            if (sz > off) {
              ch = off;
              return true
            }
            off -= sz;
            ++lineNo$$1;
          });
          return clipPos(this, Pos(lineNo$$1, ch))
        },
        indexFromPos: function(coords) {
          coords = clipPos(this, coords);
          var index = coords.ch;
          if (coords.line < this.first || coords.ch < 0) {
            return 0
          }
          var sepSize = this.lineSeparator().length;
          this.iter(this.first, coords.line, function(line) { // iter aborts when callback returns a truthy value
            index += line.text.length + sepSize;
          });
          return index
        },

        copy: function(copyHistory) {
          var doc = new Doc(getLines(this, this.first, this.first + this.size),
            this.modeOption, this.first, this.lineSep, this.direction);
          doc.scrollTop = this.scrollTop;
          doc.scrollLeft = this.scrollLeft;
          doc.sel = this.sel;
          doc.extend = false;
          if (copyHistory) {
            doc.history.undoDepth = this.history.undoDepth;
            doc.setHistory(this.getHistory());
          }
          return doc
        },

        linkedDoc: function(options) {
          if (!options) {
            options = {};
          }
          var from = this.first,
            to = this.first + this.size;
          if (options.from != null && options.from > from) {
            from = options.from;
          }
          if (options.to != null && options.to < to) {
            to = options.to;
          }
          var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction);
          if (options.sharedHist) {
            copy.history = this.history;
          }(this.linked || (this.linked = [])).push({
            doc: copy,
            sharedHist: options.sharedHist
          });
          copy.linked = [{
            doc: this,
            isParent: true,
            sharedHist: options.sharedHist
          }];
          copySharedMarkers(copy, findSharedMarkers(this));
          return copy
        },
        unlinkDoc: function(other) {
          var this$1 = this;

          if (other instanceof CodeMirror$1) {
            other = other.doc;
          }
          if (this.linked) {
            for (var i = 0; i < this.linked.length; ++i) {
              var link = this$1.linked[i];
              if (link.doc != other) {
                continue
              }
              this$1.linked.splice(i, 1);
              other.unlinkDoc(this$1);
              detachSharedMarkers(findSharedMarkers(this$1));
              break
            }
          }
          // If the histories were shared, split them again
          if (other.history == this.history) {
            var splitIds = [other.id];
            linkedDocs(other, function(doc) {
              return splitIds.push(doc.id);
            }, true);
            other.history = new History(null);
            other.history.done = copyHistoryArray(this.history.done, splitIds);
            other.history.undone = copyHistoryArray(this.history.undone, splitIds);
          }
        },
        iterLinkedDocs: function(f) {
          linkedDocs(this, f);
        },

        getMode: function() {
          return this.mode
        },
        getEditor: function() {
          return this.cm
        },

        splitLines: function(str) {
          if (this.lineSep) {
            return str.split(this.lineSep)
          }
          return splitLinesAuto(str)
        },
        lineSeparator: function() {
          return this.lineSep || "\n"
        },

        setDirection: docMethodOp(function(dir) {
          if (dir != "rtl") {
            dir = "ltr";
          }
          if (dir == this.direction) {
            return
          }
          this.direction = dir;
          this.iter(function(line) {
            return line.order = null;
          });
          if (this.cm) {
            directionChanged(this.cm);
          }
        })
      });

      // Public alias.
      Doc.prototype.eachLine = Doc.prototype.iter;

      // Kludge to work around strange IE behavior where it'll sometimes
      // re-fire a series of drag-related events right after the drop (#1551)
      var lastDrop = 0;

      function onDrop(e) {
        var cm = this;
        clearDragCursor(cm);
        if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) {
          return
        }
        e_preventDefault(e);
        if (ie) {
          lastDrop = +new Date;
        }
        var pos = posFromMouse(cm, e, true),
          files = e.dataTransfer.files;
        if (!pos || cm.isReadOnly()) {
          return
        }
        // Might be a file drop, in which case we simply extract the text
        // and insert it.
        if (files && files.length && window.FileReader && window.File) {
          var n = files.length,
            text = Array(n),
            read = 0;
          var loadFile = function(file, i) {
            if (cm.options.allowDropFileTypes &&
              indexOf(cm.options.allowDropFileTypes, file.type) == -1) {
              return
            }

            var reader = new FileReader;
            reader.onload = operation(cm, function() {
              var content = reader.result;
              if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) {
                content = "";
              }
              text[i] = content;
              if (++read == n) {
                pos = clipPos(cm.doc, pos);
                var change = {
                  from: pos,
                  to: pos,
                  text: cm.doc.splitLines(text.join(cm.doc.lineSeparator())),
                  origin: "paste"
                };
                makeChange(cm.doc, change);
                setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)));
              }
            });
            reader.readAsText(file);
          };
          for (var i = 0; i < n; ++i) {
            loadFile(files[i], i);
          }
        } else { // Normal drop
          // Don't do a replace if the drop happened inside of the selected text.
          if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
            cm.state.draggingText(e);
            // Ensure the editor is re-focused
            setTimeout(function() {
              return cm.display.input.focus();
            }, 20);
            return
          }
          try {
            var text$1 = e.dataTransfer.getData("Text");
            if (text$1) {
              var selected;
              if (cm.state.draggingText && !cm.state.draggingText.copy) {
                selected = cm.listSelections();
              }
              setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
              if (selected) {
                for (var i$1 = 0; i$1 < selected.length; ++i$1) {
                  replaceRange(cm.doc, "", selected[i$1].anchor, selected[i$1].head, "drag");
                }
              }
              cm.replaceSelection(text$1, "around", "paste");
              cm.display.input.focus();
            }
          } catch (e) {}
        }
      }

      function onDragStart(cm, e) {
        if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) {
          e_stop(e);
          return
        }
        if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) {
          return
        }

        e.dataTransfer.setData("Text", cm.getSelection());
        e.dataTransfer.effectAllowed = "copyMove";

        // Use dummy image instead of default browsers image.
        // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
        if (e.dataTransfer.setDragImage && !safari) {
          var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
          img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
          if (presto) {
            img.width = img.height = 1;
            cm.display.wrapper.appendChild(img);
            // Force a relayout, or Opera won't use our image for some obscure reason
            img._top = img.offsetTop;
          }
          e.dataTransfer.setDragImage(img, 0, 0);
          if (presto) {
            img.parentNode.removeChild(img);
          }
        }
      }

      function onDragOver(cm, e) {
        var pos = posFromMouse(cm, e);
        if (!pos) {
          return
        }
        var frag = document.createDocumentFragment();
        drawSelectionCursor(cm, pos, frag);
        if (!cm.display.dragCursor) {
          cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors");
          cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);
        }
        removeChildrenAndAdd(cm.display.dragCursor, frag);
      }

      function clearDragCursor(cm) {
        if (cm.display.dragCursor) {
          cm.display.lineSpace.removeChild(cm.display.dragCursor);
          cm.display.dragCursor = null;
        }
      }

      // These must be handled carefully, because naively registering a
      // handler for each editor will cause the editors to never be
      // garbage collected.

      function forEachCodeMirror(f) {
        if (!document.getElementsByClassName) {
          return
        }
        var byClass = document.getElementsByClassName("CodeMirror");
        for (var i = 0; i < byClass.length; i++) {
          var cm = byClass[i].CodeMirror;
          if (cm) {
            f(cm);
          }
        }
      }

      var globalsRegistered = false;

      function ensureGlobalHandlers() {
        if (globalsRegistered) {
          return
        }
        registerGlobalHandlers();
        globalsRegistered = true;
      }

      function registerGlobalHandlers() {
        // When the window resizes, we need to refresh active editors.
        var resizeTimer;
        on(window, "resize", function() {
          if (resizeTimer == null) {
            resizeTimer = setTimeout(function() {
              resizeTimer = null;
              forEachCodeMirror(onResize);
            }, 100);
          }
        });
        // When the window loses focus, we want to show the editor as blurred
        on(window, "blur", function() {
          return forEachCodeMirror(onBlur);
        });
      }
      // Called when the window resizes
      function onResize(cm) {
        var d = cm.display;
        if (d.lastWrapHeight == d.wrapper.clientHeight && d.lastWrapWidth == d.wrapper.clientWidth) {
          return
        }
        // Might be a text scaling operation, clear size caches.
        d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
        d.scrollbarsClipped = false;
        cm.setSize();
      }

      var keyNames = {
        3: "Pause",
        8: "Backspace",
        9: "Tab",
        13: "Enter",
        16: "Shift",
        17: "Ctrl",
        18: "Alt",
        19: "Pause",
        20: "CapsLock",
        27: "Esc",
        32: "Space",
        33: "PageUp",
        34: "PageDown",
        35: "End",
        36: "Home",
        37: "Left",
        38: "Up",
        39: "Right",
        40: "Down",
        44: "PrintScrn",
        45: "Insert",
        46: "Delete",
        59: ";",
        61: "=",
        91: "Mod",
        92: "Mod",
        93: "Mod",
        106: "*",
        107: "=",
        109: "-",
        110: ".",
        111: "/",
        127: "Delete",
        145: "ScrollLock",
        173: "-",
        186: ";",
        187: "=",
        188: ",",
        189: "-",
        190: ".",
        191: "/",
        192: "`",
        219: "[",
        220: "\\",
        221: "]",
        222: "'",
        63232: "Up",
        63233: "Down",
        63234: "Left",
        63235: "Right",
        63272: "Delete",
        63273: "Home",
        63275: "End",
        63276: "PageUp",
        63277: "PageDown",
        63302: "Insert"
      };

      // Number keys
      for (var i = 0; i < 10; i++) {
        keyNames[i + 48] = keyNames[i + 96] = String(i);
      }
      // Alphabetic keys
      for (var i$1 = 65; i$1 <= 90; i$1++) {
        keyNames[i$1] = String.fromCharCode(i$1);
      }
      // Function keys
      for (var i$2 = 1; i$2 <= 12; i$2++) {
        keyNames[i$2 + 111] = keyNames[i$2 + 63235] = "F" + i$2;
      }

      var keyMap = {};

      keyMap.basic = {
        "Left": "goCharLeft",
        "Right": "goCharRight",
        "Up": "goLineUp",
        "Down": "goLineDown",
        "End": "goLineEnd",
        "Home": "goLineStartSmart",
        "PageUp": "goPageUp",
        "PageDown": "goPageDown",
        "Delete": "delCharAfter",
        "Backspace": "delCharBefore",
        "Shift-Backspace": "delCharBefore",
        "Tab": "defaultTab",
        "Shift-Tab": "indentAuto",
        "Enter": "newlineAndIndent",
        "Insert": "toggleOverwrite",
        "Esc": "singleSelection"
      };
      // Note that the save and find-related commands aren't defined by
      // default. User code or addons can define them. Unknown commands
      // are simply ignored.
      keyMap.pcDefault = {
        "Ctrl-A": "selectAll",
        "Ctrl-D": "deleteLine",
        "Ctrl-Z": "undo",
        "Shift-Ctrl-Z": "redo",
        "Ctrl-Y": "redo",
        "Ctrl-Home": "goDocStart",
        "Ctrl-End": "goDocEnd",
        "Ctrl-Up": "goLineUp",
        "Ctrl-Down": "goLineDown",
        "Ctrl-Left": "goGroupLeft",
        "Ctrl-Right": "goGroupRight",
        "Alt-Left": "goLineStart",
        "Alt-Right": "goLineEnd",
        "Ctrl-Backspace": "delGroupBefore",
        "Ctrl-Delete": "delGroupAfter",
        "Ctrl-S": "save",
        "Ctrl-F": "find",
        "Ctrl-G": "findNext",
        "Shift-Ctrl-G": "findPrev",
        "Shift-Ctrl-F": "replace",
        "Shift-Ctrl-R": "replaceAll",
        "Ctrl-[": "indentLess",
        "Ctrl-]": "indentMore",
        "Ctrl-U": "undoSelection",
        "Shift-Ctrl-U": "redoSelection",
        "Alt-U": "redoSelection",
        fallthrough: "basic"
      };
      // Very basic readline/emacs-style bindings, which are standard on Mac.
      keyMap.emacsy = {
        "Ctrl-F": "goCharRight",
        "Ctrl-B": "goCharLeft",
        "Ctrl-P": "goLineUp",
        "Ctrl-N": "goLineDown",
        "Alt-F": "goWordRight",
        "Alt-B": "goWordLeft",
        "Ctrl-A": "goLineStart",
        "Ctrl-E": "goLineEnd",
        "Ctrl-V": "goPageDown",
        "Shift-Ctrl-V": "goPageUp",
        "Ctrl-D": "delCharAfter",
        "Ctrl-H": "delCharBefore",
        "Alt-D": "delWordAfter",
        "Alt-Backspace": "delWordBefore",
        "Ctrl-K": "killLine",
        "Ctrl-T": "transposeChars",
        "Ctrl-O": "openLine"
      };
      keyMap.macDefault = {
        "Cmd-A": "selectAll",
        "Cmd-D": "deleteLine",
        "Cmd-Z": "undo",
        "Shift-Cmd-Z": "redo",
        "Cmd-Y": "redo",
        "Cmd-Home": "goDocStart",
        "Cmd-Up": "goDocStart",
        "Cmd-End": "goDocEnd",
        "Cmd-Down": "goDocEnd",
        "Alt-Left": "goGroupLeft",
        "Alt-Right": "goGroupRight",
        "Cmd-Left": "goLineLeft",
        "Cmd-Right": "goLineRight",
        "Alt-Backspace": "delGroupBefore",
        "Ctrl-Alt-Backspace": "delGroupAfter",
        "Alt-Delete": "delGroupAfter",
        "Cmd-S": "save",
        "Cmd-F": "find",
        "Cmd-G": "findNext",
        "Shift-Cmd-G": "findPrev",
        "Cmd-Alt-F": "replace",
        "Shift-Cmd-Alt-F": "replaceAll",
        "Cmd-[": "indentLess",
        "Cmd-]": "indentMore",
        "Cmd-Backspace": "delWrappedLineLeft",
        "Cmd-Delete": "delWrappedLineRight",
        "Cmd-U": "undoSelection",
        "Shift-Cmd-U": "redoSelection",
        "Ctrl-Up": "goDocStart",
        "Ctrl-Down": "goDocEnd",
        fallthrough: ["basic", "emacsy"]
      };
      keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;

      // KEYMAP DISPATCH

      function normalizeKeyName(name) {
        var parts = name.split(/-(?!$)/);
        name = parts[parts.length - 1];
        var alt, ctrl, shift, cmd;
        for (var i = 0; i < parts.length - 1; i++) {
          var mod = parts[i];
          if (/^(cmd|meta|m)$/i.test(mod)) {
            cmd = true;
          } else if (/^a(lt)?$/i.test(mod)) {
            alt = true;
          } else if (/^(c|ctrl|control)$/i.test(mod)) {
            ctrl = true;
          } else if (/^s(hift)?$/i.test(mod)) {
            shift = true;
          } else {
            throw new Error("Unrecognized modifier name: " + mod)
          }
        }
        if (alt) {
          name = "Alt-" + name;
        }
        if (ctrl) {
          name = "Ctrl-" + name;
        }
        if (cmd) {
          name = "Cmd-" + name;
        }
        if (shift) {
          name = "Shift-" + name;
        }
        return name
      }

      // This is a kludge to keep keymaps mostly working as raw objects
      // (backwards compatibility) while at the same time support features
      // like normalization and multi-stroke key bindings. It compiles a
      // new normalized keymap, and then updates the old object to reflect
      // this.
      function normalizeKeyMap(keymap) {
        var copy = {};
        for (var keyname in keymap) {
          if (keymap.hasOwnProperty(keyname)) {
            var value = keymap[keyname];
            if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) {
              continue
            }
            if (value == "...") {
              delete keymap[keyname];
              continue
            }

            var keys = map(keyname.split(" "), normalizeKeyName);
            for (var i = 0; i < keys.length; i++) {
              var val = (void 0),
                name = (void 0);
              if (i == keys.length - 1) {
                name = keys.join(" ");
                val = value;
              } else {
                name = keys.slice(0, i + 1).join(" ");
                val = "...";
              }
              var prev = copy[name];
              if (!prev) {
                copy[name] = val;
              } else if (prev != val) {
                throw new Error("Inconsistent bindings for " + name)
              }
            }
            delete keymap[keyname];
          }
        }
        for (var prop in copy) {
          keymap[prop] = copy[prop];
        }
        return keymap
      }

      function lookupKey(key, map$$1, handle, context) {
        map$$1 = getKeyMap(map$$1);
        var found = map$$1.call ? map$$1.call(key, context) : map$$1[key];
        if (found === false) {
          return "nothing"
        }
        if (found === "...") {
          return "multi"
        }
        if (found != null && handle(found)) {
          return "handled"
        }

        if (map$$1.fallthrough) {
          if (Object.prototype.toString.call(map$$1.fallthrough) != "[object Array]") {
            return lookupKey(key, map$$1.fallthrough, handle, context)
          }
          for (var i = 0; i < map$$1.fallthrough.length; i++) {
            var result = lookupKey(key, map$$1.fallthrough[i], handle, context);
            if (result) {
              return result
            }
          }
        }
      }

      // Modifier key presses don't count as 'real' key presses for the
      // purpose of keymap fallthrough.
      function isModifierKey(value) {
        var name = typeof value == "string" ? value : keyNames[value.keyCode];
        return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod"
      }

      function addModifierNames(name, event, noShift) {
        var base = name;
        if (event.altKey && base != "Alt") {
          name = "Alt-" + name;
        }
        if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") {
          name = "Ctrl-" + name;
        }
        if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Cmd") {
          name = "Cmd-" + name;
        }
        if (!noShift && event.shiftKey && base != "Shift") {
          name = "Shift-" + name;
        }
        return name
      }

      // Look up the name of a key as indicated by an event object.
      function keyName(event, noShift) {
        if (presto && event.keyCode == 34 && event["char"]) {
          return false
        }
        var name = keyNames[event.keyCode];
        if (name == null || event.altGraphKey) {
          return false
        }
        // Ctrl-ScrollLock has keyCode 3, same as Ctrl-Pause,
        // so we'll use event.code when available (Chrome 48+, FF 38+, Safari 10.1+)
        if (event.keyCode == 3 && event.code) {
          name = event.code;
        }
        return addModifierNames(name, event, noShift)
      }

      function getKeyMap(val) {
        return typeof val == "string" ? keyMap[val] : val
      }

      // Helper for deleting text near the selection(s), used to implement
      // backspace, delete, and similar functionality.
      function deleteNearSelection(cm, compute) {
        var ranges = cm.doc.sel.ranges,
          kill = [];
        // Build up a set of ranges to kill first, merging overlapping
        // ranges.
        for (var i = 0; i < ranges.length; i++) {
          var toKill = compute(ranges[i]);
          while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
            var replaced = kill.pop();
            if (cmp(replaced.from, toKill.from) < 0) {
              toKill.from = replaced.from;
              break
            }
          }
          kill.push(toKill);
        }
        // Next, remove those actual ranges.
        runInOp(cm, function() {
          for (var i = kill.length - 1; i >= 0; i--) {
            replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete");
          }
          ensureCursorVisible(cm);
        });
      }

      function moveCharLogically(line, ch, dir) {
        var target = skipExtendingChars(line.text, ch + dir, dir);
        return target < 0 || target > line.text.length ? null : target
      }

      function moveLogically(line, start, dir) {
        var ch = moveCharLogically(line, start.ch, dir);
        return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")
      }

      function endOfLine(visually, cm, lineObj, lineNo, dir) {
        if (visually) {
          var order = getOrder(lineObj, cm.doc.direction);
          if (order) {
            var part = dir < 0 ? lst(order) : order[0];
            var moveInStorageOrder = (dir < 0) == (part.level == 1);
            var sticky = moveInStorageOrder ? "after" : "before";
            var ch;
            // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
            // it could be that the last bidi part is not on the last visual line,
            // since visual lines contain content order-consecutive chunks.
            // Thus, in rtl, we are looking for the first (content-order) character
            // in the rtl chunk that is on the last line (that is, the same line
            // as the last (content-order) character).
            if (part.level > 0 || cm.doc.direction == "rtl") {
              var prep = prepareMeasureForLine(cm, lineObj);
              ch = dir < 0 ? lineObj.text.length - 1 : 0;
              var targetTop = measureCharPrepared(cm, prep, ch).top;
              ch = findFirst(function(ch) {
                return measureCharPrepared(cm, prep, ch).top == targetTop;
              }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch);
              if (sticky == "before") {
                ch = moveCharLogically(lineObj, ch, 1);
              }
            } else {
              ch = dir < 0 ? part.to : part.from;
            }
            return new Pos(lineNo, ch, sticky)
          }
        }
        return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")
      }

      function moveVisually(cm, line, start, dir) {
        var bidi = getOrder(line, cm.doc.direction);
        if (!bidi) {
          return moveLogically(line, start, dir)
        }
        if (start.ch >= line.text.length) {
          start.ch = line.text.length;
          start.sticky = "before";
        } else if (start.ch <= 0) {
          start.ch = 0;
          start.sticky = "after";
        }
        var partPos = getBidiPartAt(bidi, start.ch, start.sticky),
          part = bidi[partPos];
        if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {
          // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
          // nothing interesting happens.
          return moveLogically(line, start, dir)
        }

        var mv = function(pos, dir) {
          return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir);
        };
        var prep;
        var getWrappedLineExtent = function(ch) {
          if (!cm.options.lineWrapping) {
            return {
              begin: 0,
              end: line.text.length
            }
          }
          prep = prep || prepareMeasureForLine(cm, line);
          return wrappedLineExtentChar(cm, line, prep, ch)
        };
        var wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch);

        if (cm.doc.direction == "rtl" || part.level == 1) {
          var moveInStorageOrder = (part.level == 1) == (dir < 0);
          var ch = mv(start, moveInStorageOrder ? 1 : -1);
          if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {
            // Case 2: We move within an rtl part or in an rtl editor on the same visual line
            var sticky = moveInStorageOrder ? "before" : "after";
            return new Pos(start.line, ch, sticky)
          }
        }

        // Case 3: Could not move within this bidi part in this visual line, so leave
        // the current bidi part

        var searchInVisualLine = function(partPos, dir, wrappedLineExtent) {
          var getRes = function(ch, moveInStorageOrder) {
            return moveInStorageOrder ?
              new Pos(start.line, mv(ch, 1), "before") :
              new Pos(start.line, ch, "after");
          };

          for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
            var part = bidi[partPos];
            var moveInStorageOrder = (dir > 0) == (part.level != 1);
            var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1);
            if (part.from <= ch && ch < part.to) {
              return getRes(ch, moveInStorageOrder)
            }
            ch = moveInStorageOrder ? part.from : mv(part.to, -1);
            if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) {
              return getRes(ch, moveInStorageOrder)
            }
          }
        };

        // Case 3a: Look for other bidi parts on the same visual line
        var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent);
        if (res) {
          return res
        }

        // Case 3b: Look for other bidi parts on the next visual line
        var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1);
        if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
          res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh));
          if (res) {
            return res
          }
        }

        // Case 4: Nowhere to move
        return null
      }

      // Commands are parameter-less actions that can be performed on an
      // editor, mostly used for keybindings.
      var commands = {
        selectAll: selectAll,
        singleSelection: function(cm) {
          return cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll);
        },
        killLine: function(cm) {
          return deleteNearSelection(cm, function(range) {
            if (range.empty()) {
              var len = getLine(cm.doc, range.head.line).text.length;
              if (range.head.ch == len && range.head.line < cm.lastLine()) {
                return {
                  from: range.head,
                  to: Pos(range.head.line + 1, 0)
                }
              } else {
                return {
                  from: range.head,
                  to: Pos(range.head.line, len)
                }
              }
            } else {
              return {
                from: range.from(),
                to: range.to()
              }
            }
          });
        },
        deleteLine: function(cm) {
          return deleteNearSelection(cm, function(range) {
            return ({
              from: Pos(range.from().line, 0),
              to: clipPos(cm.doc, Pos(range.to().line + 1, 0))
            });
          });
        },
        delLineLeft: function(cm) {
          return deleteNearSelection(cm, function(range) {
            return ({
              from: Pos(range.from().line, 0),
              to: range.from()
            });
          });
        },
        delWrappedLineLeft: function(cm) {
          return deleteNearSelection(cm, function(range) {
            var top = cm.charCoords(range.head, "div").top + 5;
            var leftPos = cm.coordsChar({
              left: 0,
              top: top
            }, "div");
            return {
              from: leftPos,
              to: range.from()
            }
          });
        },
        delWrappedLineRight: function(cm) {
          return deleteNearSelection(cm, function(range) {
            var top = cm.charCoords(range.head, "div").top + 5;
            var rightPos = cm.coordsChar({
              left: cm.display.lineDiv.offsetWidth + 100,
              top: top
            }, "div");
            return {
              from: range.from(),
              to: rightPos
            }
          });
        },
        undo: function(cm) {
          return cm.undo();
        },
        redo: function(cm) {
          return cm.redo();
        },
        undoSelection: function(cm) {
          return cm.undoSelection();
        },
        redoSelection: function(cm) {
          return cm.redoSelection();
        },
        goDocStart: function(cm) {
          return cm.extendSelection(Pos(cm.firstLine(), 0));
        },
        goDocEnd: function(cm) {
          return cm.extendSelection(Pos(cm.lastLine()));
        },
        goLineStart: function(cm) {
          return cm.extendSelectionsBy(function(range) {
            return lineStart(cm, range.head.line);
          }, {
            origin: "+move",
            bias: 1
          });
        },
        goLineStartSmart: function(cm) {
          return cm.extendSelectionsBy(function(range) {
            return lineStartSmart(cm, range.head);
          }, {
            origin: "+move",
            bias: 1
          });
        },
        goLineEnd: function(cm) {
          return cm.extendSelectionsBy(function(range) {
            return lineEnd(cm, range.head.line);
          }, {
            origin: "+move",
            bias: -1
          });
        },
        goLineRight: function(cm) {
          return cm.extendSelectionsBy(function(range) {
            var top = cm.cursorCoords(range.head, "div").top + 5;
            return cm.coordsChar({
              left: cm.display.lineDiv.offsetWidth + 100,
              top: top
            }, "div")
          }, sel_move);
        },
        goLineLeft: function(cm) {
          return cm.extendSelectionsBy(function(range) {
            var top = cm.cursorCoords(range.head, "div").top + 5;
            return cm.coordsChar({
              left: 0,
              top: top
            }, "div")
          }, sel_move);
        },
        goLineLeftSmart: function(cm) {
          return cm.extendSelectionsBy(function(range) {
            var top = cm.cursorCoords(range.head, "div").top + 5;
            var pos = cm.coordsChar({
              left: 0,
              top: top
            }, "div");
            if (pos.ch < cm.getLine(pos.line).search(/\S/)) {
              return lineStartSmart(cm, range.head)
            }
            return pos
          }, sel_move);
        },
        goLineUp: function(cm) {
          return cm.moveV(-1, "line");
        },
        goLineDown: function(cm) {
          return cm.moveV(1, "line");
        },
        goPageUp: function(cm) {
          return cm.moveV(-1, "page");
        },
        goPageDown: function(cm) {
          return cm.moveV(1, "page");
        },
        goCharLeft: function(cm) {
          return cm.moveH(-1, "char");
        },
        goCharRight: function(cm) {
          return cm.moveH(1, "char");
        },
        goColumnLeft: function(cm) {
          return cm.moveH(-1, "column");
        },
        goColumnRight: function(cm) {
          return cm.moveH(1, "column");
        },
        goWordLeft: function(cm) {
          return cm.moveH(-1, "word");
        },
        goGroupRight: function(cm) {
          return cm.moveH(1, "group");
        },
        goGroupLeft: function(cm) {
          return cm.moveH(-1, "group");
        },
        goWordRight: function(cm) {
          return cm.moveH(1, "word");
        },
        delCharBefore: function(cm) {
          return cm.deleteH(-1, "char");
        },
        delCharAfter: function(cm) {
          return cm.deleteH(1, "char");
        },
        delWordBefore: function(cm) {
          return cm.deleteH(-1, "word");
        },
        delWordAfter: function(cm) {
          return cm.deleteH(1, "word");
        },
        delGroupBefore: function(cm) {
          return cm.deleteH(-1, "group");
        },
        delGroupAfter: function(cm) {
          return cm.deleteH(1, "group");
        },
        indentAuto: function(cm) {
          return cm.indentSelection("smart");
        },
        indentMore: function(cm) {
          return cm.indentSelection("add");
        },
        indentLess: function(cm) {
          return cm.indentSelection("subtract");
        },
        insertTab: function(cm) {
          return cm.replaceSelection("\t");
        },
        insertSoftTab: function(cm) {
          var spaces = [],
            ranges = cm.listSelections(),
            tabSize = cm.options.tabSize;
          for (var i = 0; i < ranges.length; i++) {
            var pos = ranges[i].from();
            var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
            spaces.push(spaceStr(tabSize - col % tabSize));
          }
          cm.replaceSelections(spaces);
        },
        defaultTab: function(cm) {
          if (cm.somethingSelected()) {
            cm.indentSelection("add");
          } else {
            cm.execCommand("insertTab");
          }
        },
        // Swap the two chars left and right of each selection's head.
        // Move cursor behind the two swapped characters afterwards.
        //
        // Doesn't consider line feeds a character.
        // Doesn't scan more than one line above to find a character.
        // Doesn't do anything on an empty line.
        // Doesn't do anything with non-empty selections.
        transposeChars: function(cm) {
          return runInOp(cm, function() {
            var ranges = cm.listSelections(),
              newSel = [];
            for (var i = 0; i < ranges.length; i++) {
              if (!ranges[i].empty()) {
                continue
              }
              var cur = ranges[i].head,
                line = getLine(cm.doc, cur.line).text;
              if (line) {
                if (cur.ch == line.length) {
                  cur = new Pos(cur.line, cur.ch - 1);
                }
                if (cur.ch > 0) {
                  cur = new Pos(cur.line, cur.ch + 1);
                  cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
                    Pos(cur.line, cur.ch - 2), cur, "+transpose");
                } else if (cur.line > cm.doc.first) {
                  var prev = getLine(cm.doc, cur.line - 1).text;
                  if (prev) {
                    cur = new Pos(cur.line, 1);
                    cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
                      prev.charAt(prev.length - 1),
                      Pos(cur.line - 1, prev.length - 1), cur, "+transpose");
                  }
                }
              }
              newSel.push(new Range(cur, cur));
            }
            cm.setSelections(newSel);
          });
        },
        newlineAndIndent: function(cm) {
          return runInOp(cm, function() {
            var sels = cm.listSelections();
            for (var i = sels.length - 1; i >= 0; i--) {
              cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, "+input");
            }
            sels = cm.listSelections();
            for (var i$1 = 0; i$1 < sels.length; i$1++) {
              cm.indentLine(sels[i$1].from().line, null, true);
            }
            ensureCursorVisible(cm);
          });
        },
        openLine: function(cm) {
          return cm.replaceSelection("\n", "start");
        },
        toggleOverwrite: function(cm) {
          return cm.toggleOverwrite();
        }
      };


      function lineStart(cm, lineN) {
        var line = getLine(cm.doc, lineN);
        var visual = visualLine(line);
        if (visual != line) {
          lineN = lineNo(visual);
        }
        return endOfLine(true, cm, visual, lineN, 1)
      }

      function lineEnd(cm, lineN) {
        var line = getLine(cm.doc, lineN);
        var visual = visualLineEnd(line);
        if (visual != line) {
          lineN = lineNo(visual);
        }
        return endOfLine(true, cm, line, lineN, -1)
      }

      function lineStartSmart(cm, pos) {
        var start = lineStart(cm, pos.line);
        var line = getLine(cm.doc, start.line);
        var order = getOrder(line, cm.doc.direction);
        if (!order || order[0].level == 0) {
          var firstNonWS = Math.max(0, line.text.search(/\S/));
          var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
          return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)
        }
        return start
      }

      // Run a handler that was bound to a key.
      function doHandleBinding(cm, bound, dropShift) {
        if (typeof bound == "string") {
          bound = commands[bound];
          if (!bound) {
            return false
          }
        }
        // Ensure previous input has been read, so that the handler sees a
        // consistent view of the document
        cm.display.input.ensurePolled();
        var prevShift = cm.display.shift,
          done = false;
        try {
          if (cm.isReadOnly()) {
            cm.state.suppressEdits = true;
          }
          if (dropShift) {
            cm.display.shift = false;
          }
          done = bound(cm) != Pass;
        } finally {
          cm.display.shift = prevShift;
          cm.state.suppressEdits = false;
        }
        return done
      }

      function lookupKeyForEditor(cm, name, handle) {
        for (var i = 0; i < cm.state.keyMaps.length; i++) {
          var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
          if (result) {
            return result
          }
        }
        return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm)) ||
          lookupKey(name, cm.options.keyMap, handle, cm)
      }

      // Note that, despite the name, this function is also used to check
      // for bound mouse clicks.

      var stopSeq = new Delayed;

      function dispatchKey(cm, name, e, handle) {
        var seq = cm.state.keySeq;
        if (seq) {
          if (isModifierKey(name)) {
            return "handled"
          }
          if (/\'$/.test(name)) {
            cm.state.keySeq = null;
          } else {
            stopSeq.set(50, function() {
              if (cm.state.keySeq == seq) {
                cm.state.keySeq = null;
                cm.display.input.reset();
              }
            });
          }
          if (dispatchKeyInner(cm, seq + " " + name, e, handle)) {
            return true
          }
        }
        return dispatchKeyInner(cm, name, e, handle)
      }

      function dispatchKeyInner(cm, name, e, handle) {
        var result = lookupKeyForEditor(cm, name, handle);

        if (result == "multi") {
          cm.state.keySeq = name;
        }
        if (result == "handled") {
          signalLater(cm, "keyHandled", cm, name, e);
        }

        if (result == "handled" || result == "multi") {
          e_preventDefault(e);
          restartBlink(cm);
        }

        return !!result
      }

      // Handle a key from the keydown event.
      function handleKeyBinding(cm, e) {
        var name = keyName(e, true);
        if (!name) {
          return false
        }

        if (e.shiftKey && !cm.state.keySeq) {
          // First try to resolve full name (including 'Shift-'). Failing
          // that, see if there is a cursor-motion command (starting with
          // 'go') bound to the keyname without 'Shift-'.
          return dispatchKey(cm, "Shift-" + name, e, function(b) {
              return doHandleBinding(cm, b, true);
            }) ||
            dispatchKey(cm, name, e, function(b) {
              if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion) {
                return doHandleBinding(cm, b)
              }
            })
        } else {
          return dispatchKey(cm, name, e, function(b) {
            return doHandleBinding(cm, b);
          })
        }
      }

      // Handle a key from the keypress event
      function handleCharBinding(cm, e, ch) {
        return dispatchKey(cm, "'" + ch + "'", e, function(b) {
          return doHandleBinding(cm, b, true);
        })
      }

      var lastStoppedKey = null;

      function onKeyDown(e) {
        var cm = this;
        cm.curOp.focus = activeElt();
        if (signalDOMEvent(cm, e)) {
          return
        }
        // IE does strange things with escape.
        if (ie && ie_version < 11 && e.keyCode == 27) {
          e.returnValue = false;
        }
        var code = e.keyCode;
        cm.display.shift = code == 16 || e.shiftKey;
        var handled = handleKeyBinding(cm, e);
        if (presto) {
          lastStoppedKey = handled ? code : null;
          // Opera has no cut event... we try to at least catch the key combo
          if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey)) {
            cm.replaceSelection("", null, "cut");
          }
        }

        // Turn mouse into crosshair when Alt is held on Mac.
        if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className)) {
          showCrossHair(cm);
        }
      }

      function showCrossHair(cm) {
        var lineDiv = cm.display.lineDiv;
        addClass(lineDiv, "CodeMirror-crosshair");

        function up(e) {
          if (e.keyCode == 18 || !e.altKey) {
            rmClass(lineDiv, "CodeMirror-crosshair");
            off(document, "keyup", up);
            off(document, "mouseover", up);
          }
        }
        on(document, "keyup", up);
        on(document, "mouseover", up);
      }

      function onKeyUp(e) {
        if (e.keyCode == 16) {
          this.doc.sel.shift = false;
        }
        signalDOMEvent(this, e);
      }

      function onKeyPress(e) {
        var cm = this;
        if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) {
          return
        }
        var keyCode = e.keyCode,
          charCode = e.charCode;
        if (presto && keyCode == lastStoppedKey) {
          lastStoppedKey = null;
          e_preventDefault(e);
          return
        }
        if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) {
          return
        }
        var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
        // Some browsers fire keypress events for backspace
        if (ch == "\x08") {
          return
        }
        if (handleCharBinding(cm, e, ch)) {
          return
        }
        cm.display.input.onKeyPress(e);
      }

      var DOUBLECLICK_DELAY = 400;

      var PastClick = function(time, pos, button) {
        this.time = time;
        this.pos = pos;
        this.button = button;
      };

      PastClick.prototype.compare = function(time, pos, button) {
        return this.time + DOUBLECLICK_DELAY > time &&
          cmp(pos, this.pos) == 0 && button == this.button
      };

      var lastClick;
      var lastDoubleClick;

      function clickRepeat(pos, button) {
        var now = +new Date;
        if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {
          lastClick = lastDoubleClick = null;
          return "triple"
        } else if (lastClick && lastClick.compare(now, pos, button)) {
          lastDoubleClick = new PastClick(now, pos, button);
          lastClick = null;
          return "double"
        } else {
          lastClick = new PastClick(now, pos, button);
          lastDoubleClick = null;
          return "single"
        }
      }

      // A mouse down can be a single click, double click, triple click,
      // start of selection drag, start of text drag, new cursor
      // (ctrl-click), rectangle drag (alt-drag), or xwin
      // middle-click-paste. Or it might be a click on something we should
      // not interfere with, such as a scrollbar or widget.
      function onMouseDown(e) {
        var cm = this,
          display = cm.display;
        if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) {
          return
        }
        display.input.ensurePolled();
        display.shift = e.shiftKey;

        if (eventInWidget(display, e)) {
          if (!webkit) {
            // Briefly turn off draggability, to allow widgets to do
            // normal dragging things.
            display.scroller.draggable = false;
            setTimeout(function() {
              return display.scroller.draggable = true;
            }, 100);
          }
          return
        }
        if (clickInGutter(cm, e)) {
          return
        }
        var pos = posFromMouse(cm, e),
          button = e_button(e),
          repeat = pos ? clickRepeat(pos, button) : "single";
        window.focus();

        // #3261: make sure, that we're not starting a second selection
        if (button == 1 && cm.state.selectingText) {
          cm.state.selectingText(e);
        }

        if (pos && handleMappedButton(cm, button, pos, repeat, e)) {
          return
        }

        if (button == 1) {
          if (pos) {
            leftButtonDown(cm, pos, repeat, e);
          } else if (e_target(e) == display.scroller) {
            e_preventDefault(e);
          }
        } else if (button == 2) {
          if (pos) {
            extendSelection(cm.doc, pos);
          }
          setTimeout(function() {
            return display.input.focus();
          }, 20);
        } else if (button == 3) {
          if (captureRightClick) {
            onContextMenu(cm, e);
          } else {
            delayBlurEvent(cm);
          }
        }
      }

      function handleMappedButton(cm, button, pos, repeat, event) {
        var name = "Click";
        if (repeat == "double") {
          name = "Double" + name;
        } else if (repeat == "triple") {
          name = "Triple" + name;
        }
        name = (button == 1 ? "Left" : button == 2 ? "Middle" : "Right") + name;

        return dispatchKey(cm, addModifierNames(name, event), event, function(bound) {
          if (typeof bound == "string") {
            bound = commands[bound];
          }
          if (!bound) {
            return false
          }
          var done = false;
          try {
            if (cm.isReadOnly()) {
              cm.state.suppressEdits = true;
            }
            done = bound(cm, pos) != Pass;
          } finally {
            cm.state.suppressEdits = false;
          }
          return done
        })
      }

      function configureMouse(cm, repeat, event) {
        var option = cm.getOption("configureMouse");
        var value = option ? option(cm, repeat, event) : {};
        if (value.unit == null) {
          var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey;
          value.unit = rect ? "rectangle" : repeat == "single" ? "char" : repeat == "double" ? "word" : "line";
        }
        if (value.extend == null || cm.doc.extend) {
          value.extend = cm.doc.extend || event.shiftKey;
        }
        if (value.addNew == null) {
          value.addNew = mac ? event.metaKey : event.ctrlKey;
        }
        if (value.moveOnDrag == null) {
          value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey);
        }
        return value
      }

      function leftButtonDown(cm, pos, repeat, event) {
        if (ie) {
          setTimeout(bind(ensureFocus, cm), 0);
        } else {
          cm.curOp.focus = activeElt();
        }

        var behavior = configureMouse(cm, repeat, event);

        var sel = cm.doc.sel,
          contained;
        if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
          repeat == "single" && (contained = sel.contains(pos)) > -1 &&
          (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&
          (cmp(contained.to(), pos) > 0 || pos.xRel < 0)) {
          leftButtonStartDrag(cm, event, pos, behavior);
        } else {
          leftButtonSelect(cm, event, pos, behavior);
        }
      }

      // Start a text drag. When it ends, see if any dragging actually
      // happen, and treat as a click if it didn't.
      function leftButtonStartDrag(cm, event, pos, behavior) {
        var display = cm.display,
          moved = false;
        var dragEnd = operation(cm, function(e) {
          if (webkit) {
            display.scroller.draggable = false;
          }
          cm.state.draggingText = false;
          off(document, "mouseup", dragEnd);
          off(document, "mousemove", mouseMove);
          off(display.scroller, "dragstart", dragStart);
          off(display.scroller, "drop", dragEnd);
          if (!moved) {
            e_preventDefault(e);
            if (!behavior.addNew) {
              extendSelection(cm.doc, pos, null, null, behavior.extend);
            }
            // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
            if (webkit || ie && ie_version == 9) {
              setTimeout(function() {
                document.body.focus();
                display.input.focus();
              }, 20);
            } else {
              display.input.focus();
            }
          }
        });
        var mouseMove = function(e2) {
          moved = moved || Math.abs(event.clientX - e2.clientX) + Math.abs(event.clientY - e2.clientY) >= 10;
        };
        var dragStart = function() {
          return moved = true;
        };
        // Let the drag handler handle this.
        if (webkit) {
          display.scroller.draggable = true;
        }
        cm.state.draggingText = dragEnd;
        dragEnd.copy = !behavior.moveOnDrag;
        // IE's approach to draggable
        if (display.scroller.dragDrop) {
          display.scroller.dragDrop();
        }
        on(document, "mouseup", dragEnd);
        on(document, "mousemove", mouseMove);
        on(display.scroller, "dragstart", dragStart);
        on(display.scroller, "drop", dragEnd);

        delayBlurEvent(cm);
        setTimeout(function() {
          return display.input.focus();
        }, 20);
      }

      function rangeForUnit(cm, pos, unit) {
        if (unit == "char") {
          return new Range(pos, pos)
        }
        if (unit == "word") {
          return cm.findWordAt(pos)
        }
        if (unit == "line") {
          return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0)))
        }
        var result = unit(cm, pos);
        return new Range(result.from, result.to)
      }

      // Normal selection, as opposed to text dragging.
      function leftButtonSelect(cm, event, start, behavior) {
        var display = cm.display,
          doc = cm.doc;
        e_preventDefault(event);

        var ourRange, ourIndex, startSel = doc.sel,
          ranges = startSel.ranges;
        if (behavior.addNew && !behavior.extend) {
          ourIndex = doc.sel.contains(start);
          if (ourIndex > -1) {
            ourRange = ranges[ourIndex];
          } else {
            ourRange = new Range(start, start);
          }
        } else {
          ourRange = doc.sel.primary();
          ourIndex = doc.sel.primIndex;
        }

        if (behavior.unit == "rectangle") {
          if (!behavior.addNew) {
            ourRange = new Range(start, start);
          }
          start = posFromMouse(cm, event, true, true);
          ourIndex = -1;
        } else {
          var range$$1 = rangeForUnit(cm, start, behavior.unit);
          if (behavior.extend) {
            ourRange = extendRange(ourRange, range$$1.anchor, range$$1.head, behavior.extend);
          } else {
            ourRange = range$$1;
          }
        }

        if (!behavior.addNew) {
          ourIndex = 0;
          setSelection(doc, new Selection([ourRange], 0), sel_mouse);
          startSel = doc.sel;
        } else if (ourIndex == -1) {
          ourIndex = ranges.length;
          setSelection(doc, normalizeSelection(ranges.concat([ourRange]), ourIndex), {
            scroll: false,
            origin: "*mouse"
          });
        } else if (ranges.length > 1 && ranges[ourIndex].empty() && behavior.unit == "char" && !behavior.extend) {
          setSelection(doc, normalizeSelection(ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0), {
            scroll: false,
            origin: "*mouse"
          });
          startSel = doc.sel;
        } else {
          replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
        }

        var lastPos = start;

        function extendTo(pos) {
          if (cmp(lastPos, pos) == 0) {
            return
          }
          lastPos = pos;

          if (behavior.unit == "rectangle") {
            var ranges = [],
              tabSize = cm.options.tabSize;
            var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);
            var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
            var left = Math.min(startCol, posCol),
              right = Math.max(startCol, posCol);
            for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line)); line <= end; line++) {
              var text = getLine(doc, line).text,
                leftPos = findColumn(text, left, tabSize);
              if (left == right) {
                ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos)));
              } else if (text.length > leftPos) {
                ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize))));
              }
            }
            if (!ranges.length) {
              ranges.push(new Range(start, start));
            }
            setSelection(doc, normalizeSelection(startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex), {
              origin: "*mouse",
              scroll: false
            });
            cm.scrollIntoView(pos);
          } else {
            var oldRange = ourRange;
            var range$$1 = rangeForUnit(cm, pos, behavior.unit);
            var anchor = oldRange.anchor,
              head;
            if (cmp(range$$1.anchor, anchor) > 0) {
              head = range$$1.head;
              anchor = minPos(oldRange.from(), range$$1.anchor);
            } else {
              head = range$$1.anchor;
              anchor = maxPos(oldRange.to(), range$$1.head);
            }
            var ranges$1 = startSel.ranges.slice(0);
            ranges$1[ourIndex] = bidiSimplify(cm, new Range(clipPos(doc, anchor), head));
            setSelection(doc, normalizeSelection(ranges$1, ourIndex), sel_mouse);
          }
        }

        var editorSize = display.wrapper.getBoundingClientRect();
        // Used to ensure timeout re-tries don't fire when another extend
        // happened in the meantime (clearTimeout isn't reliable -- at
        // least on Chrome, the timeouts still happen even when cleared,
        // if the clear happens after their scheduled firing time).
        var counter = 0;

        function extend(e) {
          var curCount = ++counter;
          var cur = posFromMouse(cm, e, true, behavior.unit == "rectangle");
          if (!cur) {
            return
          }
          if (cmp(cur, lastPos) != 0) {
            cm.curOp.focus = activeElt();
            extendTo(cur);
            var visible = visibleLines(display, doc);
            if (cur.line >= visible.to || cur.line < visible.from) {
              setTimeout(operation(cm, function() {
                if (counter == curCount) {
                  extend(e);
                }
              }), 150);
            }
          } else {
            var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
            if (outside) {
              setTimeout(operation(cm, function() {
                if (counter != curCount) {
                  return
                }
                display.scroller.scrollTop += outside;
                extend(e);
              }), 50);
            }
          }
        }

        function done(e) {
          cm.state.selectingText = false;
          counter = Infinity;
          e_preventDefault(e);
          display.input.focus();
          off(document, "mousemove", move);
          off(document, "mouseup", up);
          doc.history.lastSelOrigin = null;
        }

        var move = operation(cm, function(e) {
          if (!e_button(e)) {
            done(e);
          } else {
            extend(e);
          }
        });
        var up = operation(cm, done);
        cm.state.selectingText = up;
        on(document, "mousemove", move);
        on(document, "mouseup", up);
      }

      // Used when mouse-selecting to adjust the anchor to the proper side
      // of a bidi jump depending on the visual position of the head.
      function bidiSimplify(cm, range$$1) {
        var anchor = range$$1.anchor;
        var head = range$$1.head;
        var anchorLine = getLine(cm.doc, anchor.line);
        if (cmp(anchor, head) == 0 && anchor.sticky == head.sticky) {
          return range$$1
        }
        var order = getOrder(anchorLine);
        if (!order) {
          return range$$1
        }
        var index = getBidiPartAt(order, anchor.ch, anchor.sticky),
          part = order[index];
        if (part.from != anchor.ch && part.to != anchor.ch) {
          return range$$1
        }
        var boundary = index + ((part.from == anchor.ch) == (part.level != 1) ? 0 : 1);
        if (boundary == 0 || boundary == order.length) {
          return range$$1
        }

        // Compute the relative visual position of the head compared to the
        // anchor (<0 is to the left, >0 to the right)
        var leftSide;
        if (head.line != anchor.line) {
          leftSide = (head.line - anchor.line) * (cm.doc.direction == "ltr" ? 1 : -1) > 0;
        } else {
          var headIndex = getBidiPartAt(order, head.ch, head.sticky);
          var dir = headIndex - index || (head.ch - anchor.ch) * (part.level == 1 ? -1 : 1);
          if (headIndex == boundary - 1 || headIndex == boundary) {
            leftSide = dir < 0;
          } else {
            leftSide = dir > 0;
          }
        }

        var usePart = order[boundary + (leftSide ? -1 : 0)];
        var from = leftSide == (usePart.level == 1);
        var ch = from ? usePart.from : usePart.to,
          sticky = from ? "after" : "before";
        return anchor.ch == ch && anchor.sticky == sticky ? range$$1 : new Range(new Pos(anchor.line, ch, sticky), head)
      }


      // Determines whether an event happened in the gutter, and fires the
      // handlers for the corresponding event.
      function gutterEvent(cm, e, type, prevent) {
        var mX, mY;
        if (e.touches) {
          mX = e.touches[0].clientX;
          mY = e.touches[0].clientY;
        } else {
          try {
            mX = e.clientX;
            mY = e.clientY;
          } catch (e) {
            return false
          }
        }
        if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) {
          return false
        }
        if (prevent) {
          e_preventDefault(e);
        }

        var display = cm.display;
        var lineBox = display.lineDiv.getBoundingClientRect();

        if (mY > lineBox.bottom || !hasHandler(cm, type)) {
          return e_defaultPrevented(e)
        }
        mY -= lineBox.top - display.viewOffset;

        for (var i = 0; i < cm.options.gutters.length; ++i) {
          var g = display.gutters.childNodes[i];
          if (g && g.getBoundingClientRect().right >= mX) {
            var line = lineAtHeight(cm.doc, mY);
            var gutter = cm.options.gutters[i];
            signal(cm, type, cm, line, gutter, e);
            return e_defaultPrevented(e)
          }
        }
      }

      function clickInGutter(cm, e) {
        return gutterEvent(cm, e, "gutterClick", true)
      }

      // CONTEXT MENU HANDLING

      // To make the context menu work, we need to briefly unhide the
      // textarea (making it as unobtrusive as possible) to let the
      // right-click take effect on it.
      function onContextMenu(cm, e) {
        if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) {
          return
        }
        if (signalDOMEvent(cm, e, "contextmenu")) {
          return
        }
        cm.display.input.onContextMenu(e);
      }

      function contextMenuInGutter(cm, e) {
        if (!hasHandler(cm, "gutterContextMenu")) {
          return false
        }
        return gutterEvent(cm, e, "gutterContextMenu", false)
      }

      function themeChanged(cm) {
        cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
          cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
        clearCaches(cm);
      }

      var Init = {
        toString: function() {
          return "CodeMirror.Init"
        }
      };

      var defaults = {};
      var optionHandlers = {};

      function defineOptions(CodeMirror) {
        var optionHandlers = CodeMirror.optionHandlers;

        function option(name, deflt, handle, notOnInit) {
          CodeMirror.defaults[name] = deflt;
          if (handle) {
            optionHandlers[name] =
              notOnInit ? function(cm, val, old) {
                if (old != Init) {
                  handle(cm, val, old);
                }
              } : handle;
          }
        }

        CodeMirror.defineOption = option;

        // Passed to option handlers when there is no old value.
        CodeMirror.Init = Init;

        // These two are, on init, called from the constructor because they
        // have to be initialized before the editor can start at all.
        option("value", "", function(cm, val) {
          return cm.setValue(val);
        }, true);
        option("mode", null, function(cm, val) {
          cm.doc.modeOption = val;
          loadMode(cm);
        }, true);

        option("indentUnit", 2, loadMode, true);
        option("indentWithTabs", false);
        option("smartIndent", true);
        option("tabSize", 4, function(cm) {
          resetModeState(cm);
          clearCaches(cm);
          regChange(cm);
        }, true);

        option("lineSeparator", null, function(cm, val) {
          cm.doc.lineSep = val;
          if (!val) {
            return
          }
          var newBreaks = [],
            lineNo = cm.doc.first;
          cm.doc.iter(function(line) {
            for (var pos = 0;;) {
              var found = line.text.indexOf(val, pos);
              if (found == -1) {
                break
              }
              pos = found + val.length;
              newBreaks.push(Pos(lineNo, found));
            }
            lineNo++;
          });
          for (var i = newBreaks.length - 1; i >= 0; i--) {
            replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length));
          }
        });
        option("specialChars", /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b-\u200f\u2028\u2029\ufeff]/g, function(cm, val, old) {
          cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
          if (old != Init) {
            cm.refresh();
          }
        });
        option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function(cm) {
          return cm.refresh();
        }, true);
        option("electricChars", true);
        option("inputStyle", mobile ? "contenteditable" : "textarea", function() {
          throw new Error("inputStyle can not (yet) be changed in a running editor") // FIXME
        }, true);
        option("spellcheck", false, function(cm, val) {
          return cm.getInputField().spellcheck = val;
        }, true);
        option("rtlMoveVisually", !windows);
        option("wholeLineUpdateBefore", true);

        option("theme", "default", function(cm) {
          themeChanged(cm);
          guttersChanged(cm);
        }, true);
        option("keyMap", "default", function(cm, val, old) {
          var next = getKeyMap(val);
          var prev = old != Init && getKeyMap(old);
          if (prev && prev.detach) {
            prev.detach(cm, next);
          }
          if (next.attach) {
            next.attach(cm, prev || null);
          }
        });
        option("extraKeys", null);
        option("configureMouse", null);

        option("lineWrapping", false, wrappingChanged, true);
        option("gutters", [], function(cm) {
          setGuttersForLineNumbers(cm.options);
          guttersChanged(cm);
        }, true);
        option("fixedGutter", true, function(cm, val) {
          cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
          cm.refresh();
        }, true);
        option("coverGutterNextToScrollbar", false, function(cm) {
          return updateScrollbars(cm);
        }, true);
        option("scrollbarStyle", "native", function(cm) {
          initScrollbars(cm);
          updateScrollbars(cm);
          cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);
          cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);
        }, true);
        option("lineNumbers", false, function(cm) {
          setGuttersForLineNumbers(cm.options);
          guttersChanged(cm);
        }, true);
        option("firstLineNumber", 1, guttersChanged, true);
        option("lineNumberFormatter", function(integer) {
          return integer;
        }, guttersChanged, true);
        option("showCursorWhenSelecting", false, updateSelection, true);

        option("resetSelectionOnContextMenu", true);
        option("lineWiseCopyCut", true);
        option("pasteLinesPerSelection", true);

        option("readOnly", false, function(cm, val) {
          if (val == "nocursor") {
            onBlur(cm);
            cm.display.input.blur();
          }
          cm.display.input.readOnlyChanged(val);
        });
        option("disableInput", false, function(cm, val) {
          if (!val) {
            cm.display.input.reset();
          }
        }, true);
        option("dragDrop", true, dragDropChanged);
        option("allowDropFileTypes", null);

        option("cursorBlinkRate", 530);
        option("cursorScrollMargin", 0);
        option("cursorHeight", 1, updateSelection, true);
        option("singleCursorHeightPerLine", true, updateSelection, true);
        option("workTime", 100);
        option("workDelay", 100);
        option("flattenSpans", true, resetModeState, true);
        option("addModeClass", false, resetModeState, true);
        option("pollInterval", 100);
        option("undoDepth", 200, function(cm, val) {
          return cm.doc.history.undoDepth = val;
        });
        option("historyEventDelay", 1250);
        option("viewportMargin", 10, function(cm) {
          return cm.refresh();
        }, true);
        option("maxHighlightLength", 10000, resetModeState, true);
        option("moveInputWithCursor", true, function(cm, val) {
          if (!val) {
            cm.display.input.resetPosition();
          }
        });

        option("tabindex", null, function(cm, val) {
          return cm.display.input.getField().tabIndex = val || "";
        });
        option("autofocus", null);
        option("direction", "ltr", function(cm, val) {
          return cm.doc.setDirection(val);
        }, true);
      }

      function guttersChanged(cm) {
        updateGutters(cm);
        regChange(cm);
        alignHorizontally(cm);
      }

      function dragDropChanged(cm, value, old) {
        var wasOn = old && old != Init;
        if (!value != !wasOn) {
          var funcs = cm.display.dragFunctions;
          var toggle = value ? on : off;
          toggle(cm.display.scroller, "dragstart", funcs.start);
          toggle(cm.display.scroller, "dragenter", funcs.enter);
          toggle(cm.display.scroller, "dragover", funcs.over);
          toggle(cm.display.scroller, "dragleave", funcs.leave);
          toggle(cm.display.scroller, "drop", funcs.drop);
        }
      }

      function wrappingChanged(cm) {
        if (cm.options.lineWrapping) {
          addClass(cm.display.wrapper, "CodeMirror-wrap");
          cm.display.sizer.style.minWidth = "";
          cm.display.sizerWidth = null;
        } else {
          rmClass(cm.display.wrapper, "CodeMirror-wrap");
          findMaxLine(cm);
        }
        estimateLineHeights(cm);
        regChange(cm);
        clearCaches(cm);
        setTimeout(function() {
          return updateScrollbars(cm);
        }, 100);
      }

      // A CodeMirror instance represents an editor. This is the object
      // that user code is usually dealing with.

      function CodeMirror$1(place, options) {
        var this$1 = this;

        if (!(this instanceof CodeMirror$1)) {
          return new CodeMirror$1(place, options)
        }

        this.options = options = options ? copyObj(options) : {};
        // Determine effective options based on given values and defaults.
        copyObj(defaults, options, false);
        setGuttersForLineNumbers(options);

        var doc = options.value;
        if (typeof doc == "string") {
          doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction);
        }
        this.doc = doc;

        var input = new CodeMirror$1.inputStyles[options.inputStyle](this);
        var display = this.display = new Display(place, doc, input);
        display.wrapper.CodeMirror = this;
        updateGutters(this);
        themeChanged(this);
        if (options.lineWrapping) {
          this.display.wrapper.className += " CodeMirror-wrap";
        }
        initScrollbars(this);

        this.state = {
          keyMaps: [], // stores maps added by addKeyMap
          overlays: [], // highlighting overlays, as added by addOverlay
          modeGen: 0, // bumped when mode/overlay changes, used to invalidate highlighting info
          overwrite: false,
          delayingBlurEvent: false,
          focused: false,
          suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
          pasteIncoming: false,
          cutIncoming: false, // help recognize paste/cut edits in input.poll
          selectingText: false,
          draggingText: false,
          highlight: new Delayed(), // stores highlight worker timeout
          keySeq: null, // Unfinished key sequence
          specialChars: null
        };

        if (options.autofocus && !mobile) {
          display.input.focus();
        }

        // Override magic textarea content restore that IE sometimes does
        // on our hidden textarea on reload
        if (ie && ie_version < 11) {
          setTimeout(function() {
            return this$1.display.input.reset(true);
          }, 20);
        }

        registerEventHandlers(this);
        ensureGlobalHandlers();

        startOperation(this);
        this.curOp.forceUpdate = true;
        attachDoc(this, doc);

        if ((options.autofocus && !mobile) || this.hasFocus()) {
          setTimeout(bind(onFocus, this), 20);
        } else {
          onBlur(this);
        }

        for (var opt in optionHandlers) {
          if (optionHandlers.hasOwnProperty(opt)) {
            optionHandlers[opt](this$1, options[opt], Init);
          }
        }
        maybeUpdateLineNumberWidth(this);
        if (options.finishInit) {
          options.finishInit(this);
        }
        for (var i = 0; i < initHooks.length; ++i) {
          initHooks[i](this$1);
        }
        endOperation(this);
        // Suppress optimizelegibility in Webkit, since it breaks text
        // measuring on line wrapping boundaries.
        if (webkit && options.lineWrapping &&
          getComputedStyle(display.lineDiv).textRendering == "optimizelegibility") {
          display.lineDiv.style.textRendering = "auto";
        }
      }

      // The default configuration options.
      CodeMirror$1.defaults = defaults;
      // Functions to run when options are changed.
      CodeMirror$1.optionHandlers = optionHandlers;

      // Attach the necessary event handlers when initializing the editor
      function registerEventHandlers(cm) {
        var d = cm.display;
        on(d.scroller, "mousedown", operation(cm, onMouseDown));
        // Older IE's will not fire a second mousedown for a double click
        if (ie && ie_version < 11) {
          on(d.scroller, "dblclick", operation(cm, function(e) {
            if (signalDOMEvent(cm, e)) {
              return
            }
            var pos = posFromMouse(cm, e);
            if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) {
              return
            }
            e_preventDefault(e);
            var word = cm.findWordAt(pos);
            extendSelection(cm.doc, word.anchor, word.head);
          }));
        } else {
          on(d.scroller, "dblclick", function(e) {
            return signalDOMEvent(cm, e) || e_preventDefault(e);
          });
        }
        // Some browsers fire contextmenu *after* opening the menu, at
        // which point we can't mess with it anymore. Context menu is
        // handled in onMouseDown for these browsers.
        if (!captureRightClick) {
          on(d.scroller, "contextmenu", function(e) {
            return onContextMenu(cm, e);
          });
        }

        // Used to suppress mouse event handling when a touch happens
        var touchFinished, prevTouch = {
          end: 0
        };

        function finishTouch() {
          if (d.activeTouch) {
            touchFinished = setTimeout(function() {
              return d.activeTouch = null;
            }, 1000);
            prevTouch = d.activeTouch;
            prevTouch.end = +new Date;
          }
        }

        function isMouseLikeTouchEvent(e) {
          if (e.touches.length != 1) {
            return false
          }
          var touch = e.touches[0];
          return touch.radiusX <= 1 && touch.radiusY <= 1
        }

        function farAway(touch, other) {
          if (other.left == null) {
            return true
          }
          var dx = other.left - touch.left,
            dy = other.top - touch.top;
          return dx * dx + dy * dy > 20 * 20
        }
        on(d.scroller, "touchstart", function(e) {
          if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e) && !clickInGutter(cm, e)) {
            d.input.ensurePolled();
            clearTimeout(touchFinished);
            var now = +new Date;
            d.activeTouch = {
              start: now,
              moved: false,
              prev: now - prevTouch.end <= 300 ? prevTouch : null
            };
            if (e.touches.length == 1) {
              d.activeTouch.left = e.touches[0].pageX;
              d.activeTouch.top = e.touches[0].pageY;
            }
          }
        });
        on(d.scroller, "touchmove", function() {
          if (d.activeTouch) {
            d.activeTouch.moved = true;
          }
        });
        on(d.scroller, "touchend", function(e) {
          var touch = d.activeTouch;
          if (touch && !eventInWidget(d, e) && touch.left != null &&
            !touch.moved && new Date - touch.start < 300) {
            var pos = cm.coordsChar(d.activeTouch, "page"),
              range;
            if (!touch.prev || farAway(touch, touch.prev)) // Single tap
            {
              range = new Range(pos, pos);
            } else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
            {
              range = cm.findWordAt(pos);
            } else // Triple tap
            {
              range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0)));
            }
            cm.setSelection(range.anchor, range.head);
            cm.focus();
            e_preventDefault(e);
          }
          finishTouch();
        });
        on(d.scroller, "touchcancel", finishTouch);

        // Sync scrolling between fake scrollbars and real scrollable
        // area, ensure viewport is updated when scrolling.
        on(d.scroller, "scroll", function() {
          if (d.scroller.clientHeight) {
            updateScrollTop(cm, d.scroller.scrollTop);
            setScrollLeft(cm, d.scroller.scrollLeft, true);
            signal(cm, "scroll", cm);
          }
        });

        // Listen to wheel events in order to try and update the viewport on time.
        on(d.scroller, "mousewheel", function(e) {
          return onScrollWheel(cm, e);
        });
        on(d.scroller, "DOMMouseScroll", function(e) {
          return onScrollWheel(cm, e);
        });

        // Prevent wrapper from ever scrolling
        on(d.wrapper, "scroll", function() {
          return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0;
        });

        d.dragFunctions = {
          enter: function(e) {
            if (!signalDOMEvent(cm, e)) {
              e_stop(e);
            }
          },
          over: function(e) {
            if (!signalDOMEvent(cm, e)) {
              onDragOver(cm, e);
              e_stop(e);
            }
          },
          start: function(e) {
            return onDragStart(cm, e);
          },
          drop: operation(cm, onDrop),
          leave: function(e) {
            if (!signalDOMEvent(cm, e)) {
              clearDragCursor(cm);
            }
          }
        };

        var inp = d.input.getField();
        on(inp, "keyup", function(e) {
          return onKeyUp.call(cm, e);
        });
        on(inp, "keydown", operation(cm, onKeyDown));
        on(inp, "keypress", operation(cm, onKeyPress));
        on(inp, "focus", function(e) {
          return onFocus(cm, e);
        });
        on(inp, "blur", function(e) {
          return onBlur(cm, e);
        });
      }

      var initHooks = [];
      CodeMirror$1.defineInitHook = function(f) {
        return initHooks.push(f);
      };

      // Indent the given line. The how parameter can be "smart",
      // "add"/null, "subtract", or "prev". When aggressive is false
      // (typically set to true for forced single-line indents), empty
      // lines are not indented, and places where the mode returns Pass
      // are left alone.
      function indentLine(cm, n, how, aggressive) {
        var doc = cm.doc,
          state;
        if (how == null) {
          how = "add";
        }
        if (how == "smart") {
          // Fall back to "prev" when the mode doesn't have an indentation
          // method.
          if (!doc.mode.indent) {
            how = "prev";
          } else {
            state = getContextBefore(cm, n).state;
          }
        }

        var tabSize = cm.options.tabSize;
        var line = getLine(doc, n),
          curSpace = countColumn(line.text, null, tabSize);
        if (line.stateAfter) {
          line.stateAfter = null;
        }
        var curSpaceString = line.text.match(/^\s*/)[0],
          indentation;
        if (!aggressive && !/\S/.test(line.text)) {
          indentation = 0;
          how = "not";
        } else if (how == "smart") {
          indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
          if (indentation == Pass || indentation > 150) {
            if (!aggressive) {
              return
            }
            how = "prev";
          }
        }
        if (how == "prev") {
          if (n > doc.first) {
            indentation = countColumn(getLine(doc, n - 1).text, null, tabSize);
          } else {
            indentation = 0;
          }
        } else if (how == "add") {
          indentation = curSpace + cm.options.indentUnit;
        } else if (how == "subtract") {
          indentation = curSpace - cm.options.indentUnit;
        } else if (typeof how == "number") {
          indentation = curSpace + how;
        }
        indentation = Math.max(0, indentation);

        var indentString = "",
          pos = 0;
        if (cm.options.indentWithTabs) {
          for (var i = Math.floor(indentation / tabSize); i; --i) {
            pos += tabSize;
            indentString += "\t";
          }
        }
        if (pos < indentation) {
          indentString += spaceStr(indentation - pos);
        }

        if (indentString != curSpaceString) {
          replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
          line.stateAfter = null;
          return true
        } else {
          // Ensure that, if the cursor was in the whitespace at the start
          // of the line, it is moved to the end of that space.
          for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {
            var range = doc.sel.ranges[i$1];
            if (range.head.line == n && range.head.ch < curSpaceString.length) {
              var pos$1 = Pos(n, curSpaceString.length);
              replaceOneSelection(doc, i$1, new Range(pos$1, pos$1));
              break
            }
          }
        }
      }

      // This will be set to a {lineWise: bool, text: [string]} object, so
      // that, when pasting, we know what kind of selections the copied
      // text was made out of.
      var lastCopied = null;

      function setLastCopied(newLastCopied) {
        lastCopied = newLastCopied;
      }

      function applyTextInput(cm, inserted, deleted, sel, origin) {
        var doc = cm.doc;
        cm.display.shift = false;
        if (!sel) {
          sel = doc.sel;
        }

        var paste = cm.state.pasteIncoming || origin == "paste";
        var textLines = splitLinesAuto(inserted),
          multiPaste = null;
        // When pasting N lines into N selections, insert one line per selection
        if (paste && sel.ranges.length > 1) {
          if (lastCopied && lastCopied.text.join("\n") == inserted) {
            if (sel.ranges.length % lastCopied.text.length == 0) {
              multiPaste = [];
              for (var i = 0; i < lastCopied.text.length; i++) {
                multiPaste.push(doc.splitLines(lastCopied.text[i]));
              }
            }
          } else if (textLines.length == sel.ranges.length && cm.options.pasteLinesPerSelection) {
            multiPaste = map(textLines, function(l) {
              return [l];
            });
          }
        }

        var updateInput;
        // Normal behavior is to insert the new text into every selection
        for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {
          var range$$1 = sel.ranges[i$1];
          var from = range$$1.from(),
            to = range$$1.to();
          if (range$$1.empty()) {
            if (deleted && deleted > 0) // Handle deletion
            {
              from = Pos(from.line, from.ch - deleted);
            } else if (cm.state.overwrite && !paste) // Handle overwrite
            {
              to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length));
            } else if (lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == inserted) {
              from = to = Pos(from.line, 0);
            }
          }
          updateInput = cm.curOp.updateInput;
          var changeEvent = {
            from: from,
            to: to,
            text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,
            origin: origin || (paste ? "paste" : cm.state.cutIncoming ? "cut" : "+input")
          };
          makeChange(cm.doc, changeEvent);
          signalLater(cm, "inputRead", cm, changeEvent);
        }
        if (inserted && !paste) {
          triggerElectric(cm, inserted);
        }

        ensureCursorVisible(cm);
        cm.curOp.updateInput = updateInput;
        cm.curOp.typing = true;
        cm.state.pasteIncoming = cm.state.cutIncoming = false;
      }

      function handlePaste(e, cm) {
        var pasted = e.clipboardData && e.clipboardData.getData("Text");
        if (pasted) {
          e.preventDefault();
          if (!cm.isReadOnly() && !cm.options.disableInput) {
            runInOp(cm, function() {
              return applyTextInput(cm, pasted, 0, null, "paste");
            });
          }
          return true
        }
      }

      function triggerElectric(cm, inserted) {
        // When an 'electric' character is inserted, immediately trigger a reindent
        if (!cm.options.electricChars || !cm.options.smartIndent) {
          return
        }
        var sel = cm.doc.sel;

        for (var i = sel.ranges.length - 1; i >= 0; i--) {
          var range$$1 = sel.ranges[i];
          if (range$$1.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range$$1.head.line)) {
            continue
          }
          var mode = cm.getModeAt(range$$1.head);
          var indented = false;
          if (mode.electricChars) {
            for (var j = 0; j < mode.electricChars.length; j++) {
              if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
                indented = indentLine(cm, range$$1.head.line, "smart");
                break
              }
            }
          } else if (mode.electricInput) {
            if (mode.electricInput.test(getLine(cm.doc, range$$1.head.line).text.slice(0, range$$1.head.ch))) {
              indented = indentLine(cm, range$$1.head.line, "smart");
            }
          }
          if (indented) {
            signalLater(cm, "electricInput", cm, range$$1.head.line);
          }
        }
      }

      function copyableRanges(cm) {
        var text = [],
          ranges = [];
        for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
          var line = cm.doc.sel.ranges[i].head.line;
          var lineRange = {
            anchor: Pos(line, 0),
            head: Pos(line + 1, 0)
          };
          ranges.push(lineRange);
          text.push(cm.getRange(lineRange.anchor, lineRange.head));
        }
        return {
          text: text,
          ranges: ranges
        }
      }

      function disableBrowserMagic(field, spellcheck) {
        field.setAttribute("autocorrect", "off");
        field.setAttribute("autocapitalize", "off");
        field.setAttribute("spellcheck", !!spellcheck);
      }

      function hiddenTextarea() {
        var te = elt("textarea", null, null, "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; outline: none");
        var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
        // The textarea is kept positioned near the cursor to prevent the
        // fact that it'll be scrolled into view on input from scrolling
        // our fake cursor out of view. On webkit, when wrap=off, paste is
        // very slow. So make the area wide instead.
        if (webkit) {
          te.style.width = "1000px";
        } else {
          te.setAttribute("wrap", "off");
        }
        // If border: 0; -- iOS fails to open keyboard (issue #1287)
        if (ios) {
          te.style.border = "1px solid black";
        }
        disableBrowserMagic(te);
        return div
      }

      // The publicly visible API. Note that methodOp(f) means
      // 'wrap f in an operation, performed on its `this` parameter'.

      // This is not the complete set of editor methods. Most of the
      // methods defined on the Doc type are also injected into
      // CodeMirror.prototype, for backwards compatibility and
      // convenience.

      var addEditorMethods = function(CodeMirror) {
        var optionHandlers = CodeMirror.optionHandlers;

        var helpers = CodeMirror.helpers = {};

        CodeMirror.prototype = {
          constructor: CodeMirror,
          focus: function() {
            window.focus();
            this.display.input.focus();
          },

          setOption: function(option, value) {
            var options = this.options,
              old = options[option];
            if (options[option] == value && option != "mode") {
              return
            }
            options[option] = value;
            if (optionHandlers.hasOwnProperty(option)) {
              operation(this, optionHandlers[option])(this, value, old);
            }
            signal(this, "optionChange", this, option);
          },

          getOption: function(option) {
            return this.options[option]
          },
          getDoc: function() {
            return this.doc
          },

          addKeyMap: function(map$$1, bottom) {
            this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map$$1));
          },
          removeKeyMap: function(map$$1) {
            var maps = this.state.keyMaps;
            for (var i = 0; i < maps.length; ++i) {
              if (maps[i] == map$$1 || maps[i].name == map$$1) {
                maps.splice(i, 1);
                return true
              }
            }
          },

          addOverlay: methodOp(function(spec, options) {
            var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
            if (mode.startState) {
              throw new Error("Overlays may not be stateful.")
            }
            insertSorted(this.state.overlays, {
                mode: mode,
                modeSpec: spec,
                opaque: options && options.opaque,
                priority: (options && options.priority) || 0
              },
              function(overlay) {
                return overlay.priority;
              });
            this.state.modeGen++;
            regChange(this);
          }),
          removeOverlay: methodOp(function(spec) {
            var this$1 = this;

            var overlays = this.state.overlays;
            for (var i = 0; i < overlays.length; ++i) {
              var cur = overlays[i].modeSpec;
              if (cur == spec || typeof spec == "string" && cur.name == spec) {
                overlays.splice(i, 1);
                this$1.state.modeGen++;
                regChange(this$1);
                return
              }
            }
          }),

          indentLine: methodOp(function(n, dir, aggressive) {
            if (typeof dir != "string" && typeof dir != "number") {
              if (dir == null) {
                dir = this.options.smartIndent ? "smart" : "prev";
              } else {
                dir = dir ? "add" : "subtract";
              }
            }
            if (isLine(this.doc, n)) {
              indentLine(this, n, dir, aggressive);
            }
          }),
          indentSelection: methodOp(function(how) {
            var this$1 = this;

            var ranges = this.doc.sel.ranges,
              end = -1;
            for (var i = 0; i < ranges.length; i++) {
              var range$$1 = ranges[i];
              if (!range$$1.empty()) {
                var from = range$$1.from(),
                  to = range$$1.to();
                var start = Math.max(end, from.line);
                end = Math.min(this$1.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
                for (var j = start; j < end; ++j) {
                  indentLine(this$1, j, how);
                }
                var newRanges = this$1.doc.sel.ranges;
                if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0) {
                  replaceOneSelection(this$1.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll);
                }
              } else if (range$$1.head.line > end) {
                indentLine(this$1, range$$1.head.line, how, true);
                end = range$$1.head.line;
                if (i == this$1.doc.sel.primIndex) {
                  ensureCursorVisible(this$1);
                }
              }
            }
          }),

          // Fetch the parser token for a given character. Useful for hacks
          // that want to inspect the mode state (say, for completion).
          getTokenAt: function(pos, precise) {
            return takeToken(this, pos, precise)
          },

          getLineTokens: function(line, precise) {
            return takeToken(this, Pos(line), precise, true)
          },

          getTokenTypeAt: function(pos) {
            pos = clipPos(this.doc, pos);
            var styles = getLineStyles(this, getLine(this.doc, pos.line));
            var before = 0,
              after = (styles.length - 1) / 2,
              ch = pos.ch;
            var type;
            if (ch == 0) {
              type = styles[2];
            } else {
              for (;;) {
                var mid = (before + after) >> 1;
                if ((mid ? styles[mid * 2 - 1] : 0) >= ch) {
                  after = mid;
                } else if (styles[mid * 2 + 1] < ch) {
                  before = mid + 1;
                } else {
                  type = styles[mid * 2 + 2];
                  break
                }
              }
            }
            var cut = type ? type.indexOf("overlay ") : -1;
            return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)
          },

          getModeAt: function(pos) {
            var mode = this.doc.mode;
            if (!mode.innerMode) {
              return mode
            }
            return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode
          },

          getHelper: function(pos, type) {
            return this.getHelpers(pos, type)[0]
          },

          getHelpers: function(pos, type) {
            var this$1 = this;

            var found = [];
            if (!helpers.hasOwnProperty(type)) {
              return found
            }
            var help = helpers[type],
              mode = this.getModeAt(pos);
            if (typeof mode[type] == "string") {
              if (help[mode[type]]) {
                found.push(help[mode[type]]);
              }
            } else if (mode[type]) {
              for (var i = 0; i < mode[type].length; i++) {
                var val = help[mode[type][i]];
                if (val) {
                  found.push(val);
                }
              }
            } else if (mode.helperType && help[mode.helperType]) {
              found.push(help[mode.helperType]);
            } else if (help[mode.name]) {
              found.push(help[mode.name]);
            }
            for (var i$1 = 0; i$1 < help._global.length; i$1++) {
              var cur = help._global[i$1];
              if (cur.pred(mode, this$1) && indexOf(found, cur.val) == -1) {
                found.push(cur.val);
              }
            }
            return found
          },

          getStateAfter: function(line, precise) {
            var doc = this.doc;
            line = clipLine(doc, line == null ? doc.first + doc.size - 1 : line);
            return getContextBefore(this, line + 1, precise).state
          },

          cursorCoords: function(start, mode) {
            var pos, range$$1 = this.doc.sel.primary();
            if (start == null) {
              pos = range$$1.head;
            } else if (typeof start == "object") {
              pos = clipPos(this.doc, start);
            } else {
              pos = start ? range$$1.from() : range$$1.to();
            }
            return cursorCoords(this, pos, mode || "page")
          },

          charCoords: function(pos, mode) {
            return charCoords(this, clipPos(this.doc, pos), mode || "page")
          },

          coordsChar: function(coords, mode) {
            coords = fromCoordSystem(this, coords, mode || "page");
            return coordsChar(this, coords.left, coords.top)
          },

          lineAtHeight: function(height, mode) {
            height = fromCoordSystem(this, {
              top: height,
              left: 0
            }, mode || "page").top;
            return lineAtHeight(this.doc, height + this.display.viewOffset)
          },
          heightAtLine: function(line, mode, includeWidgets) {
            var end = false,
              lineObj;
            if (typeof line == "number") {
              var last = this.doc.first + this.doc.size - 1;
              if (line < this.doc.first) {
                line = this.doc.first;
              } else if (line > last) {
                line = last;
                end = true;
              }
              lineObj = getLine(this.doc, line);
            } else {
              lineObj = line;
            }
            return intoCoordSystem(this, lineObj, {
                top: 0,
                left: 0
              }, mode || "page", includeWidgets || end).top +
              (end ? this.doc.height - heightAtLine(lineObj) : 0)
          },

          defaultTextHeight: function() {
            return textHeight(this.display)
          },
          defaultCharWidth: function() {
            return charWidth(this.display)
          },

          getViewport: function() {
            return {
              from: this.display.viewFrom,
              to: this.display.viewTo
            }
          },

          addWidget: function(pos, node, scroll, vert, horiz) {
            var display = this.display;
            pos = cursorCoords(this, clipPos(this.doc, pos));
            var top = pos.bottom,
              left = pos.left;
            node.style.position = "absolute";
            node.setAttribute("cm-ignore-events", "true");
            this.display.input.setUneditable(node);
            display.sizer.appendChild(node);
            if (vert == "over") {
              top = pos.top;
            } else if (vert == "above" || vert == "near") {
              var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
                hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
              // Default to positioning above (if specified and possible); otherwise default to positioning below
              if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight) {
                top = pos.top - node.offsetHeight;
              } else if (pos.bottom + node.offsetHeight <= vspace) {
                top = pos.bottom;
              }
              if (left + node.offsetWidth > hspace) {
                left = hspace - node.offsetWidth;
              }
            }
            node.style.top = top + "px";
            node.style.left = node.style.right = "";
            if (horiz == "right") {
              left = display.sizer.clientWidth - node.offsetWidth;
              node.style.right = "0px";
            } else {
              if (horiz == "left") {
                left = 0;
              } else if (horiz == "middle") {
                left = (display.sizer.clientWidth - node.offsetWidth) / 2;
              }
              node.style.left = left + "px";
            }
            if (scroll) {
              scrollIntoView(this, {
                left: left,
                top: top,
                right: left + node.offsetWidth,
                bottom: top + node.offsetHeight
              });
            }
          },

          triggerOnKeyDown: methodOp(onKeyDown),
          triggerOnKeyPress: methodOp(onKeyPress),
          triggerOnKeyUp: onKeyUp,
          triggerOnMouseDown: methodOp(onMouseDown),

          execCommand: function(cmd) {
            if (commands.hasOwnProperty(cmd)) {
              return commands[cmd].call(null, this)
            }
          },

          triggerElectric: methodOp(function(text) {
            triggerElectric(this, text);
          }),

          findPosH: function(from, amount, unit, visually) {
            var this$1 = this;

            var dir = 1;
            if (amount < 0) {
              dir = -1;
              amount = -amount;
            }
            var cur = clipPos(this.doc, from);
            for (var i = 0; i < amount; ++i) {
              cur = findPosH(this$1.doc, cur, dir, unit, visually);
              if (cur.hitSide) {
                break
              }
            }
            return cur
          },

          moveH: methodOp(function(dir, unit) {
            var this$1 = this;

            this.extendSelectionsBy(function(range$$1) {
              if (this$1.display.shift || this$1.doc.extend || range$$1.empty()) {
                return findPosH(this$1.doc, range$$1.head, dir, unit, this$1.options.rtlMoveVisually)
              } else {
                return dir < 0 ? range$$1.from() : range$$1.to()
              }
            }, sel_move);
          }),

          deleteH: methodOp(function(dir, unit) {
            var sel = this.doc.sel,
              doc = this.doc;
            if (sel.somethingSelected()) {
              doc.replaceSelection("", null, "+delete");
            } else {
              deleteNearSelection(this, function(range$$1) {
                var other = findPosH(doc, range$$1.head, dir, unit, false);
                return dir < 0 ? {
                  from: other,
                  to: range$$1.head
                } : {
                  from: range$$1.head,
                  to: other
                }
              });
            }
          }),

          findPosV: function(from, amount, unit, goalColumn) {
            var this$1 = this;

            var dir = 1,
              x = goalColumn;
            if (amount < 0) {
              dir = -1;
              amount = -amount;
            }
            var cur = clipPos(this.doc, from);
            for (var i = 0; i < amount; ++i) {
              var coords = cursorCoords(this$1, cur, "div");
              if (x == null) {
                x = coords.left;
              } else {
                coords.left = x;
              }
              cur = findPosV(this$1, coords, dir, unit);
              if (cur.hitSide) {
                break
              }
            }
            return cur
          },

          moveV: methodOp(function(dir, unit) {
            var this$1 = this;

            var doc = this.doc,
              goals = [];
            var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected();
            doc.extendSelectionsBy(function(range$$1) {
              if (collapse) {
                return dir < 0 ? range$$1.from() : range$$1.to()
              }
              var headPos = cursorCoords(this$1, range$$1.head, "div");
              if (range$$1.goalColumn != null) {
                headPos.left = range$$1.goalColumn;
              }
              goals.push(headPos.left);
              var pos = findPosV(this$1, headPos, dir, unit);
              if (unit == "page" && range$$1 == doc.sel.primary()) {
                addToScrollTop(this$1, charCoords(this$1, pos, "div").top - headPos.top);
              }
              return pos
            }, sel_move);
            if (goals.length) {
              for (var i = 0; i < doc.sel.ranges.length; i++) {
                doc.sel.ranges[i].goalColumn = goals[i];
              }
            }
          }),

          // Find the word at the given position (as returned by coordsChar).
          findWordAt: function(pos) {
            var doc = this.doc,
              line = getLine(doc, pos.line).text;
            var start = pos.ch,
              end = pos.ch;
            if (line) {
              var helper = this.getHelper(pos, "wordChars");
              if ((pos.sticky == "before" || end == line.length) && start) {
                --start;
              } else {
                ++end;
              }
              var startChar = line.charAt(start);
              var check = isWordChar(startChar, helper) ?
                function(ch) {
                  return isWordChar(ch, helper);
                } :
                /\s/.test(startChar) ? function(ch) {
                  return /\s/.test(ch);
                } :
                function(ch) {
                  return (!/\s/.test(ch) && !isWordChar(ch));
                };
              while (start > 0 && check(line.charAt(start - 1))) {
                --start;
              }
              while (end < line.length && check(line.charAt(end))) {
                ++end;
              }
            }
            return new Range(Pos(pos.line, start), Pos(pos.line, end))
          },

          toggleOverwrite: function(value) {
            if (value != null && value == this.state.overwrite) {
              return
            }
            if (this.state.overwrite = !this.state.overwrite) {
              addClass(this.display.cursorDiv, "CodeMirror-overwrite");
            } else {
              rmClass(this.display.cursorDiv, "CodeMirror-overwrite");
            }

            signal(this, "overwriteToggle", this, this.state.overwrite);
          },
          hasFocus: function() {
            return this.display.input.getField() == activeElt()
          },
          isReadOnly: function() {
            return !!(this.options.readOnly || this.doc.cantEdit)
          },

          scrollTo: methodOp(function(x, y) {
            scrollToCoords(this, x, y);
          }),
          getScrollInfo: function() {
            var scroller = this.display.scroller;
            return {
              left: scroller.scrollLeft,
              top: scroller.scrollTop,
              height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
              width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
              clientHeight: displayHeight(this),
              clientWidth: displayWidth(this)
            }
          },

          scrollIntoView: methodOp(function(range$$1, margin) {
            if (range$$1 == null) {
              range$$1 = {
                from: this.doc.sel.primary().head,
                to: null
              };
              if (margin == null) {
                margin = this.options.cursorScrollMargin;
              }
            } else if (typeof range$$1 == "number") {
              range$$1 = {
                from: Pos(range$$1, 0),
                to: null
              };
            } else if (range$$1.from == null) {
              range$$1 = {
                from: range$$1,
                to: null
              };
            }
            if (!range$$1.to) {
              range$$1.to = range$$1.from;
            }
            range$$1.margin = margin || 0;

            if (range$$1.from.line != null) {
              scrollToRange(this, range$$1);
            } else {
              scrollToCoordsRange(this, range$$1.from, range$$1.to, range$$1.margin);
            }
          }),

          setSize: methodOp(function(width, height) {
            var this$1 = this;

            var interpret = function(val) {
              return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val;
            };
            if (width != null) {
              this.display.wrapper.style.width = interpret(width);
            }
            if (height != null) {
              this.display.wrapper.style.height = interpret(height);
            }
            if (this.options.lineWrapping) {
              clearLineMeasurementCache(this);
            }
            var lineNo$$1 = this.display.viewFrom;
            this.doc.iter(lineNo$$1, this.display.viewTo, function(line) {
              if (line.widgets) {
                for (var i = 0; i < line.widgets.length; i++) {
                  if (line.widgets[i].noHScroll) {
                    regLineChange(this$1, lineNo$$1, "widget");
                    break
                  }
                }
              }
              ++lineNo$$1;
            });
            this.curOp.forceUpdate = true;
            signal(this, "refresh", this);
          }),

          operation: function(f) {
            return runInOp(this, f)
          },
          startOperation: function() {
            return startOperation(this)
          },
          endOperation: function() {
            return endOperation(this)
          },

          refresh: methodOp(function() {
            var oldHeight = this.display.cachedTextHeight;
            regChange(this);
            this.curOp.forceUpdate = true;
            clearCaches(this);
            scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop);
            updateGutterSpace(this);
            if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5) {
              estimateLineHeights(this);
            }
            signal(this, "refresh", this);
          }),

          swapDoc: methodOp(function(doc) {
            var old = this.doc;
            old.cm = null;
            attachDoc(this, doc);
            clearCaches(this);
            this.display.input.reset();
            scrollToCoords(this, doc.scrollLeft, doc.scrollTop);
            this.curOp.forceScroll = true;
            signalLater(this, "swapDoc", this, old);
            return old
          }),

          getInputField: function() {
            return this.display.input.getField()
          },
          getWrapperElement: function() {
            return this.display.wrapper
          },
          getScrollerElement: function() {
            return this.display.scroller
          },
          getGutterElement: function() {
            return this.display.gutters
          }
        };
        eventMixin(CodeMirror);

        CodeMirror.registerHelper = function(type, name, value) {
          if (!helpers.hasOwnProperty(type)) {
            helpers[type] = CodeMirror[type] = {
              _global: []
            };
          }
          helpers[type][name] = value;
        };
        CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {
          CodeMirror.registerHelper(type, name, value);
          helpers[type]._global.push({
            pred: predicate,
            val: value
          });
        };
      };

      // Used for horizontal relative motion. Dir is -1 or 1 (left or
      // right), unit can be "char", "column" (like char, but doesn't
      // cross line boundaries), "word" (across next word), or "group" (to
      // the start of next group of word or non-word-non-whitespace
      // chars). The visually param controls whether, in right-to-left
      // text, direction 1 means to move towards the next index in the
      // string, or towards the character to the right of the current
      // position. The resulting position will have a hitSide=true
      // property if it reached the end of the document.
      function findPosH(doc, pos, dir, unit, visually) {
        var oldPos = pos;
        var origDir = dir;
        var lineObj = getLine(doc, pos.line);

        function findNextLine() {
          var l = pos.line + dir;
          if (l < doc.first || l >= doc.first + doc.size) {
            return false
          }
          pos = new Pos(l, pos.ch, pos.sticky);
          return lineObj = getLine(doc, l)
        }

        function moveOnce(boundToLine) {
          var next;
          if (visually) {
            next = moveVisually(doc.cm, lineObj, pos, dir);
          } else {
            next = moveLogically(lineObj, pos, dir);
          }
          if (next == null) {
            if (!boundToLine && findNextLine()) {
              pos = endOfLine(visually, doc.cm, lineObj, pos.line, dir);
            } else {
              return false
            }
          } else {
            pos = next;
          }
          return true
        }

        if (unit == "char") {
          moveOnce();
        } else if (unit == "column") {
          moveOnce(true);
        } else if (unit == "word" || unit == "group") {
          var sawType = null,
            group = unit == "group";
          var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
          for (var first = true;; first = false) {
            if (dir < 0 && !moveOnce(!first)) {
              break
            }
            var cur = lineObj.text.charAt(pos.ch) || "\n";
            var type = isWordChar(cur, helper) ? "w" :
              group && cur == "\n" ? "n" :
              !group || /\s/.test(cur) ? null :
              "p";
            if (group && !first && !type) {
              type = "s";
            }
            if (sawType && sawType != type) {
              if (dir < 0) {
                dir = 1;
                moveOnce();
                pos.sticky = "after";
              }
              break
            }

            if (type) {
              sawType = type;
            }
            if (dir > 0 && !moveOnce(!first)) {
              break
            }
          }
        }
        var result = skipAtomic(doc, pos, oldPos, origDir, true);
        if (equalCursorPos(oldPos, result)) {
          result.hitSide = true;
        }
        return result
      }

      // For relative vertical movement. Dir may be -1 or 1. Unit can be
      // "page" or "line". The resulting position will have a hitSide=true
      // property if it reached the end of the document.
      function findPosV(cm, pos, dir, unit) {
        var doc = cm.doc,
          x = pos.left,
          y;
        if (unit == "page") {
          var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
          var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3);
          y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount;

        } else if (unit == "line") {
          y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
        }
        var target;
        for (;;) {
          target = coordsChar(cm, x, y);
          if (!target.outside) {
            break
          }
          if (dir < 0 ? y <= 0 : y >= doc.height) {
            target.hitSide = true;
            break
          }
          y += dir * 5;
        }
        return target
      }

      // CONTENTEDITABLE INPUT STYLE

      var ContentEditableInput = function(cm) {
        this.cm = cm;
        this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;
        this.polling = new Delayed();
        this.composing = null;
        this.gracePeriod = false;
        this.readDOMTimeout = null;
      };

      ContentEditableInput.prototype.init = function(display) {
        var this$1 = this;

        var input = this,
          cm = input.cm;
        var div = input.div = display.lineDiv;
        disableBrowserMagic(div, cm.options.spellcheck);

        on(div, "paste", function(e) {
          if (signalDOMEvent(cm, e) || handlePaste(e, cm)) {
            return
          }
          // IE doesn't fire input events, so we schedule a read for the pasted content in this way
          if (ie_version <= 11) {
            setTimeout(operation(cm, function() {
              return this$1.updateFromDOM();
            }), 20);
          }
        });

        on(div, "compositionstart", function(e) {
          this$1.composing = {
            data: e.data,
            done: false
          };
        });
        on(div, "compositionupdate", function(e) {
          if (!this$1.composing) {
            this$1.composing = {
              data: e.data,
              done: false
            };
          }
        });
        on(div, "compositionend", function(e) {
          if (this$1.composing) {
            if (e.data != this$1.composing.data) {
              this$1.readFromDOMSoon();
            }
            this$1.composing.done = true;
          }
        });

        on(div, "touchstart", function() {
          return input.forceCompositionEnd();
        });

        on(div, "input", function() {
          if (!this$1.composing) {
            this$1.readFromDOMSoon();
          }
        });

        function onCopyCut(e) {
          if (signalDOMEvent(cm, e)) {
            return
          }
          if (cm.somethingSelected()) {
            setLastCopied({
              lineWise: false,
              text: cm.getSelections()
            });
            if (e.type == "cut") {
              cm.replaceSelection("", null, "cut");
            }
          } else if (!cm.options.lineWiseCopyCut) {
            return
          } else {
            var ranges = copyableRanges(cm);
            setLastCopied({
              lineWise: true,
              text: ranges.text
            });
            if (e.type == "cut") {
              cm.operation(function() {
                cm.setSelections(ranges.ranges, 0, sel_dontScroll);
                cm.replaceSelection("", null, "cut");
              });
            }
          }
          if (e.clipboardData) {
            e.clipboardData.clearData();
            var content = lastCopied.text.join("\n");
            // iOS exposes the clipboard API, but seems to discard content inserted into it
            e.clipboardData.setData("Text", content);
            if (e.clipboardData.getData("Text") == content) {
              e.preventDefault();
              return
            }
          }
          // Old-fashioned briefly-focus-a-textarea hack
          var kludge = hiddenTextarea(),
            te = kludge.firstChild;
          cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);
          te.value = lastCopied.text.join("\n");
          var hadFocus = document.activeElement;
          selectInput(te);
          setTimeout(function() {
            cm.display.lineSpace.removeChild(kludge);
            hadFocus.focus();
            if (hadFocus == div) {
              input.showPrimarySelection();
            }
          }, 50);
        }
        on(div, "copy", onCopyCut);
        on(div, "cut", onCopyCut);
      };

      ContentEditableInput.prototype.prepareSelection = function() {
        var result = prepareSelection(this.cm, false);
        result.focus = this.cm.state.focused;
        return result
      };

      ContentEditableInput.prototype.showSelection = function(info, takeFocus) {
        if (!info || !this.cm.display.view.length) {
          return
        }
        if (info.focus || takeFocus) {
          this.showPrimarySelection();
        }
        this.showMultipleSelections(info);
      };

      ContentEditableInput.prototype.showPrimarySelection = function() {
        var sel = window.getSelection(),
          cm = this.cm,
          prim = cm.doc.sel.primary();
        var from = prim.from(),
          to = prim.to();

        if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {
          sel.removeAllRanges();
          return
        }

        var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
        var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset);
        if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
          cmp(minPos(curAnchor, curFocus), from) == 0 &&
          cmp(maxPos(curAnchor, curFocus), to) == 0) {
          return
        }

        var view = cm.display.view;
        var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) || {
          node: view[0].measure.map[2],
          offset: 0
        };
        var end = to.line < cm.display.viewTo && posToDOM(cm, to);
        if (!end) {
          var measure = view[view.length - 1].measure;
          var map$$1 = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;
          end = {
            node: map$$1[map$$1.length - 1],
            offset: map$$1[map$$1.length - 2] - map$$1[map$$1.length - 3]
          };
        }

        if (!start || !end) {
          sel.removeAllRanges();
          return
        }

        var old = sel.rangeCount && sel.getRangeAt(0),
          rng;
        try {
          rng = range(start.node, start.offset, end.offset, end.node);
        } catch (e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
        if (rng) {
          if (!gecko && cm.state.focused) {
            sel.collapse(start.node, start.offset);
            if (!rng.collapsed) {
              sel.removeAllRanges();
              sel.addRange(rng);
            }
          } else {
            sel.removeAllRanges();
            sel.addRange(rng);
          }
          if (old && sel.anchorNode == null) {
            sel.addRange(old);
          } else if (gecko) {
            this.startGracePeriod();
          }
        }
        this.rememberSelection();
      };

      ContentEditableInput.prototype.startGracePeriod = function() {
        var this$1 = this;

        clearTimeout(this.gracePeriod);
        this.gracePeriod = setTimeout(function() {
          this$1.gracePeriod = false;
          if (this$1.selectionChanged()) {
            this$1.cm.operation(function() {
              return this$1.cm.curOp.selectionChanged = true;
            });
          }
        }, 20);
      };

      ContentEditableInput.prototype.showMultipleSelections = function(info) {
        removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
        removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
      };

      ContentEditableInput.prototype.rememberSelection = function() {
        var sel = window.getSelection();
        this.lastAnchorNode = sel.anchorNode;
        this.lastAnchorOffset = sel.anchorOffset;
        this.lastFocusNode = sel.focusNode;
        this.lastFocusOffset = sel.focusOffset;
      };

      ContentEditableInput.prototype.selectionInEditor = function() {
        var sel = window.getSelection();
        if (!sel.rangeCount) {
          return false
        }
        var node = sel.getRangeAt(0).commonAncestorContainer;
        return contains(this.div, node)
      };

      ContentEditableInput.prototype.focus = function() {
        if (this.cm.options.readOnly != "nocursor") {
          if (!this.selectionInEditor()) {
            this.showSelection(this.prepareSelection(), true);
          }
          this.div.focus();
        }
      };
      ContentEditableInput.prototype.blur = function() {
        this.div.blur();
      };
      ContentEditableInput.prototype.getField = function() {
        return this.div
      };

      ContentEditableInput.prototype.supportsTouch = function() {
        return true
      };

      ContentEditableInput.prototype.receivedFocus = function() {
        var input = this;
        if (this.selectionInEditor()) {
          this.pollSelection();
        } else {
          runInOp(this.cm, function() {
            return input.cm.curOp.selectionChanged = true;
          });
        }

        function poll() {
          if (input.cm.state.focused) {
            input.pollSelection();
            input.polling.set(input.cm.options.pollInterval, poll);
          }
        }
        this.polling.set(this.cm.options.pollInterval, poll);
      };

      ContentEditableInput.prototype.selectionChanged = function() {
        var sel = window.getSelection();
        return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
          sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset
      };

      ContentEditableInput.prototype.pollSelection = function() {
        if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) {
          return
        }
        var sel = window.getSelection(),
          cm = this.cm;
        // On Android Chrome (version 56, at least), backspacing into an
        // uneditable block element will put the cursor in that element,
        // and then, because it's not editable, hide the virtual keyboard.
        // Because Android doesn't allow us to actually detect backspace
        // presses in a sane way, this code checks for when that happens
        // and simulates a backspace press in this case.
        if (android && chrome && this.cm.options.gutters.length && isInGutter(sel.anchorNode)) {
          this.cm.triggerOnKeyDown({
            type: "keydown",
            keyCode: 8,
            preventDefault: Math.abs
          });
          this.blur();
          this.focus();
          return
        }
        if (this.composing) {
          return
        }
        this.rememberSelection();
        var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
        var head = domToPos(cm, sel.focusNode, sel.focusOffset);
        if (anchor && head) {
          runInOp(cm, function() {
            setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
            if (anchor.bad || head.bad) {
              cm.curOp.selectionChanged = true;
            }
          });
        }
      };

      ContentEditableInput.prototype.pollContent = function() {
        if (this.readDOMTimeout != null) {
          clearTimeout(this.readDOMTimeout);
          this.readDOMTimeout = null;
        }

        var cm = this.cm,
          display = cm.display,
          sel = cm.doc.sel.primary();
        var from = sel.from(),
          to = sel.to();
        if (from.ch == 0 && from.line > cm.firstLine()) {
          from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length);
        }
        if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine()) {
          to = Pos(to.line + 1, 0);
        }
        if (from.line < display.viewFrom || to.line > display.viewTo - 1) {
          return false
        }

        var fromIndex, fromLine, fromNode;
        if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
          fromLine = lineNo(display.view[0].line);
          fromNode = display.view[0].node;
        } else {
          fromLine = lineNo(display.view[fromIndex].line);
          fromNode = display.view[fromIndex - 1].node.nextSibling;
        }
        var toIndex = findViewIndex(cm, to.line);
        var toLine, toNode;
        if (toIndex == display.view.length - 1) {
          toLine = display.viewTo - 1;
          toNode = display.lineDiv.lastChild;
        } else {
          toLine = lineNo(display.view[toIndex + 1].line) - 1;
          toNode = display.view[toIndex + 1].node.previousSibling;
        }

        if (!fromNode) {
          return false
        }
        var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));
        var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));
        while (newText.length > 1 && oldText.length > 1) {
          if (lst(newText) == lst(oldText)) {
            newText.pop();
            oldText.pop();
            toLine--;
          } else if (newText[0] == oldText[0]) {
            newText.shift();
            oldText.shift();
            fromLine++;
          } else {
            break
          }
        }

        var cutFront = 0,
          cutEnd = 0;
        var newTop = newText[0],
          oldTop = oldText[0],
          maxCutFront = Math.min(newTop.length, oldTop.length);
        while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront)) {
          ++cutFront;
        }
        var newBot = lst(newText),
          oldBot = lst(oldText);
        var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
          oldBot.length - (oldText.length == 1 ? cutFront : 0));
        while (cutEnd < maxCutEnd &&
          newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
          ++cutEnd;
        }
        // Try to move start of change to start of selection if ambiguous
        if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {
          while (cutFront && cutFront > from.ch &&
            newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
            cutFront--;
            cutEnd++;
          }
        }

        newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\u200b+/, "");
        newText[0] = newText[0].slice(cutFront).replace(/\u200b+$/, "");

        var chFrom = Pos(fromLine, cutFront);
        var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
        if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
          replaceRange(cm.doc, newText, chFrom, chTo, "+input");
          return true
        }
      };

      ContentEditableInput.prototype.ensurePolled = function() {
        this.forceCompositionEnd();
      };
      ContentEditableInput.prototype.reset = function() {
        this.forceCompositionEnd();
      };
      ContentEditableInput.prototype.forceCompositionEnd = function() {
        if (!this.composing) {
          return
        }
        clearTimeout(this.readDOMTimeout);
        this.composing = null;
        this.updateFromDOM();
        this.div.blur();
        this.div.focus();
      };
      ContentEditableInput.prototype.readFromDOMSoon = function() {
        var this$1 = this;

        if (this.readDOMTimeout != null) {
          return
        }
        this.readDOMTimeout = setTimeout(function() {
          this$1.readDOMTimeout = null;
          if (this$1.composing) {
            if (this$1.composing.done) {
              this$1.composing = null;
            } else {
              return
            }
          }
          this$1.updateFromDOM();
        }, 80);
      };

      ContentEditableInput.prototype.updateFromDOM = function() {
        var this$1 = this;

        if (this.cm.isReadOnly() || !this.pollContent()) {
          runInOp(this.cm, function() {
            return regChange(this$1.cm);
          });
        }
      };

      ContentEditableInput.prototype.setUneditable = function(node) {
        node.contentEditable = "false";
      };

      ContentEditableInput.prototype.onKeyPress = function(e) {
        if (e.charCode == 0) {
          return
        }
        e.preventDefault();
        if (!this.cm.isReadOnly()) {
          operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0);
        }
      };

      ContentEditableInput.prototype.readOnlyChanged = function(val) {
        this.div.contentEditable = String(val != "nocursor");
      };

      ContentEditableInput.prototype.onContextMenu = function() {};
      ContentEditableInput.prototype.resetPosition = function() {};

      ContentEditableInput.prototype.needsContentAttribute = true;

      function posToDOM(cm, pos) {
        var view = findViewForLine(cm, pos.line);
        if (!view || view.hidden) {
          return null
        }
        var line = getLine(cm.doc, pos.line);
        var info = mapFromLineView(view, line, pos.line);

        var order = getOrder(line, cm.doc.direction),
          side = "left";
        if (order) {
          var partPos = getBidiPartAt(order, pos.ch);
          side = partPos % 2 ? "right" : "left";
        }
        var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
        result.offset = result.collapse == "right" ? result.end : result.start;
        return result
      }

      function isInGutter(node) {
        for (var scan = node; scan; scan = scan.parentNode) {
          if (/CodeMirror-gutter-wrapper/.test(scan.className)) {
            return true
          }
        }
        return false
      }

      function badPos(pos, bad) {
        if (bad) {
          pos.bad = true;
        }
        return pos
      }

      function domTextBetween(cm, from, to, fromLine, toLine) {
        var text = "",
          closing = false,
          lineSep = cm.doc.lineSeparator();

        function recognizeMarker(id) {
          return function(marker) {
            return marker.id == id;
          }
        }

        function close() {
          if (closing) {
            text += lineSep;
            closing = false;
          }
        }

        function addText(str) {
          if (str) {
            close();
            text += str;
          }
        }

        function walk(node) {
          if (node.nodeType == 1) {
            var cmText = node.getAttribute("cm-text");
            if (cmText != null) {
              addText(cmText || node.textContent.replace(/\u200b/g, ""));
              return
            }
            var markerID = node.getAttribute("cm-marker"),
              range$$1;
            if (markerID) {
              var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));
              if (found.length && (range$$1 = found[0].find(0))) {
                addText(getBetween(cm.doc, range$$1.from, range$$1.to).join(lineSep));
              }
              return
            }
            if (node.getAttribute("contenteditable") == "false") {
              return
            }
            var isBlock = /^(pre|div|p)$/i.test(node.nodeName);
            if (isBlock) {
              close();
            }
            for (var i = 0; i < node.childNodes.length; i++) {
              walk(node.childNodes[i]);
            }
            if (isBlock) {
              closing = true;
            }
          } else if (node.nodeType == 3) {
            addText(node.nodeValue);
          }
        }
        for (;;) {
          walk(from);
          if (from == to) {
            break
          }
          from = from.nextSibling;
        }
        return text
      }

      function domToPos(cm, node, offset) {
        var lineNode;
        if (node == cm.display.lineDiv) {
          lineNode = cm.display.lineDiv.childNodes[offset];
          if (!lineNode) {
            return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true)
          }
          node = null;
          offset = 0;
        } else {
          for (lineNode = node;; lineNode = lineNode.parentNode) {
            if (!lineNode || lineNode == cm.display.lineDiv) {
              return null
            }
            if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) {
              break
            }
          }
        }
        for (var i = 0; i < cm.display.view.length; i++) {
          var lineView = cm.display.view[i];
          if (lineView.node == lineNode) {
            return locateNodeInLineView(lineView, node, offset)
          }
        }
      }

      function locateNodeInLineView(lineView, node, offset) {
        var wrapper = lineView.text.firstChild,
          bad = false;
        if (!node || !contains(wrapper, node)) {
          return badPos(Pos(lineNo(lineView.line), 0), true)
        }
        if (node == wrapper) {
          bad = true;
          node = wrapper.childNodes[offset];
          offset = 0;
          if (!node) {
            var line = lineView.rest ? lst(lineView.rest) : lineView.line;
            return badPos(Pos(lineNo(line), line.text.length), bad)
          }
        }

        var textNode = node.nodeType == 3 ? node : null,
          topNode = node;
        if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
          textNode = node.firstChild;
          if (offset) {
            offset = textNode.nodeValue.length;
          }
        }
        while (topNode.parentNode != wrapper) {
          topNode = topNode.parentNode;
        }
        var measure = lineView.measure,
          maps = measure.maps;

        function find(textNode, topNode, offset) {
          for (var i = -1; i < (maps ? maps.length : 0); i++) {
            var map$$1 = i < 0 ? measure.map : maps[i];
            for (var j = 0; j < map$$1.length; j += 3) {
              var curNode = map$$1[j + 2];
              if (curNode == textNode || curNode == topNode) {
                var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
                var ch = map$$1[j] + offset;
                if (offset < 0 || curNode != textNode) {
                  ch = map$$1[j + (offset ? 1 : 0)];
                }
                return Pos(line, ch)
              }
            }
          }
        }
        var found = find(textNode, topNode, offset);
        if (found) {
          return badPos(found, bad)
        }

        // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
        for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
          found = find(after, after.firstChild, 0);
          if (found) {
            return badPos(Pos(found.line, found.ch - dist), bad)
          } else {
            dist += after.textContent.length;
          }
        }
        for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {
          found = find(before, before.firstChild, -1);
          if (found) {
            return badPos(Pos(found.line, found.ch + dist$1), bad)
          } else {
            dist$1 += before.textContent.length;
          }
        }
      }

      // TEXTAREA INPUT STYLE

      var TextareaInput = function(cm) {
        this.cm = cm;
        // See input.poll and input.reset
        this.prevInput = "";

        // Flag that indicates whether we expect input to appear real soon
        // now (after some event like 'keypress' or 'input') and are
        // polling intensively.
        this.pollingFast = false;
        // Self-resetting timeout for the poller
        this.polling = new Delayed();
        // Used to work around IE issue with selection being forgotten when focus moves away from textarea
        this.hasSelection = false;
        this.composing = null;
      };

      TextareaInput.prototype.init = function(display) {
        var this$1 = this;

        var input = this,
          cm = this.cm;

        // Wraps and hides input textarea
        var div = this.wrapper = hiddenTextarea();
        // The semihidden textarea that is focused when the editor is
        // focused, and receives input.
        var te = this.textarea = div.firstChild;
        display.wrapper.insertBefore(div, display.wrapper.firstChild);

        // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
        if (ios) {
          te.style.width = "0px";
        }

        on(te, "input", function() {
          if (ie && ie_version >= 9 && this$1.hasSelection) {
            this$1.hasSelection = null;
          }
          input.poll();
        });

        on(te, "paste", function(e) {
          if (signalDOMEvent(cm, e) || handlePaste(e, cm)) {
            return
          }

          cm.state.pasteIncoming = true;
          input.fastPoll();
        });

        function prepareCopyCut(e) {
          if (signalDOMEvent(cm, e)) {
            return
          }
          if (cm.somethingSelected()) {
            setLastCopied({
              lineWise: false,
              text: cm.getSelections()
            });
          } else if (!cm.options.lineWiseCopyCut) {
            return
          } else {
            var ranges = copyableRanges(cm);
            setLastCopied({
              lineWise: true,
              text: ranges.text
            });
            if (e.type == "cut") {
              cm.setSelections(ranges.ranges, null, sel_dontScroll);
            } else {
              input.prevInput = "";
              te.value = ranges.text.join("\n");
              selectInput(te);
            }
          }
          if (e.type == "cut") {
            cm.state.cutIncoming = true;
          }
        }
        on(te, "cut", prepareCopyCut);
        on(te, "copy", prepareCopyCut);

        on(display.scroller, "paste", function(e) {
          if (eventInWidget(display, e) || signalDOMEvent(cm, e)) {
            return
          }
          cm.state.pasteIncoming = true;
          input.focus();
        });

        // Prevent normal selection in the editor (we handle our own)
        on(display.lineSpace, "selectstart", function(e) {
          if (!eventInWidget(display, e)) {
            e_preventDefault(e);
          }
        });

        on(te, "compositionstart", function() {
          var start = cm.getCursor("from");
          if (input.composing) {
            input.composing.range.clear();
          }
          input.composing = {
            start: start,
            range: cm.markText(start, cm.getCursor("to"), {
              className: "CodeMirror-composing"
            })
          };
        });
        on(te, "compositionend", function() {
          if (input.composing) {
            input.poll();
            input.composing.range.clear();
            input.composing = null;
          }
        });
      };

      TextareaInput.prototype.prepareSelection = function() {
        // Redraw the selection and/or cursor
        var cm = this.cm,
          display = cm.display,
          doc = cm.doc;
        var result = prepareSelection(cm);

        // Move the hidden textarea near the cursor to prevent scrolling artifacts
        if (cm.options.moveInputWithCursor) {
          var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
          var wrapOff = display.wrapper.getBoundingClientRect(),
            lineOff = display.lineDiv.getBoundingClientRect();
          result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
            headPos.top + lineOff.top - wrapOff.top));
          result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
            headPos.left + lineOff.left - wrapOff.left));
        }

        return result
      };

      TextareaInput.prototype.showSelection = function(drawn) {
        var cm = this.cm,
          display = cm.display;
        removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
        removeChildrenAndAdd(display.selectionDiv, drawn.selection);
        if (drawn.teTop != null) {
          this.wrapper.style.top = drawn.teTop + "px";
          this.wrapper.style.left = drawn.teLeft + "px";
        }
      };

      // Reset the input to correspond to the selection (or to be empty,
      // when not typing and nothing is selected)
      TextareaInput.prototype.reset = function(typing) {
        if (this.contextMenuPending || this.composing) {
          return
        }
        var cm = this.cm;
        if (cm.somethingSelected()) {
          this.prevInput = "";
          var content = cm.getSelection();
          this.textarea.value = content;
          if (cm.state.focused) {
            selectInput(this.textarea);
          }
          if (ie && ie_version >= 9) {
            this.hasSelection = content;
          }
        } else if (!typing) {
          this.prevInput = this.textarea.value = "";
          if (ie && ie_version >= 9) {
            this.hasSelection = null;
          }
        }
      };

      TextareaInput.prototype.getField = function() {
        return this.textarea
      };

      TextareaInput.prototype.supportsTouch = function() {
        return false
      };

      TextareaInput.prototype.focus = function() {
        if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {
          try {
            this.textarea.focus();
          } catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
        }
      };

      TextareaInput.prototype.blur = function() {
        this.textarea.blur();
      };

      TextareaInput.prototype.resetPosition = function() {
        this.wrapper.style.top = this.wrapper.style.left = 0;
      };

      TextareaInput.prototype.receivedFocus = function() {
        this.slowPoll();
      };

      // Poll for input changes, using the normal rate of polling. This
      // runs as long as the editor is focused.
      TextareaInput.prototype.slowPoll = function() {
        var this$1 = this;

        if (this.pollingFast) {
          return
        }
        this.polling.set(this.cm.options.pollInterval, function() {
          this$1.poll();
          if (this$1.cm.state.focused) {
            this$1.slowPoll();
          }
        });
      };

      // When an event has just come in that is likely to add or change
      // something in the input textarea, we poll faster, to ensure that
      // the change appears on the screen quickly.
      TextareaInput.prototype.fastPoll = function() {
        var missed = false,
          input = this;
        input.pollingFast = true;

        function p() {
          var changed = input.poll();
          if (!changed && !missed) {
            missed = true;
            input.polling.set(60, p);
          } else {
            input.pollingFast = false;
            input.slowPoll();
          }
        }
        input.polling.set(20, p);
      };

      // Read input from the textarea, and update the document to match.
      // When something is selected, it is present in the textarea, and
      // selected (unless it is huge, in which case a placeholder is
      // used). When nothing is selected, the cursor sits after previously
      // seen text (can be empty), which is stored in prevInput (we must
      // not reset the textarea when typing, because that breaks IME).
      TextareaInput.prototype.poll = function() {
        var this$1 = this;

        var cm = this.cm,
          input = this.textarea,
          prevInput = this.prevInput;
        // Since this is called a *lot*, try to bail out as cheaply as
        // possible when it is clear that nothing happened. hasSelection
        // will be the case when there is a lot of text in the textarea,
        // in which case reading its value would be expensive.
        if (this.contextMenuPending || !cm.state.focused ||
          (hasSelection(input) && !prevInput && !this.composing) ||
          cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq) {
          return false
        }

        var text = input.value;
        // If nothing changed, bail.
        if (text == prevInput && !cm.somethingSelected()) {
          return false
        }
        // Work around nonsensical selection resetting in IE9/10, and
        // inexplicable appearance of private area unicode characters on
        // some key combos in Mac (#2689).
        if (ie && ie_version >= 9 && this.hasSelection === text ||
          mac && /[\uf700-\uf7ff]/.test(text)) {
          cm.display.input.reset();
          return false
        }

        if (cm.doc.sel == cm.display.selForContextMenu) {
          var first = text.charCodeAt(0);
          if (first == 0x200b && !prevInput) {
            prevInput = "\u200b";
          }
          if (first == 0x21da) {
            this.reset();
            return this.cm.execCommand("undo")
          }
        }
        // Find the part of the input that is actually new
        var same = 0,
          l = Math.min(prevInput.length, text.length);
        while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) {
          ++same;
        }

        runInOp(cm, function() {
          applyTextInput(cm, text.slice(same), prevInput.length - same,
            null, this$1.composing ? "*compose" : null);

          // Don't leave long text in the textarea, since it makes further polling slow
          if (text.length > 1000 || text.indexOf("\n") > -1) {
            input.value = this$1.prevInput = "";
          } else {
            this$1.prevInput = text;
          }

          if (this$1.composing) {
            this$1.composing.range.clear();
            this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor("to"), {
              className: "CodeMirror-composing"
            });
          }
        });
        return true
      };

      TextareaInput.prototype.ensurePolled = function() {
        if (this.pollingFast && this.poll()) {
          this.pollingFast = false;
        }
      };

      TextareaInput.prototype.onKeyPress = function() {
        if (ie && ie_version >= 9) {
          this.hasSelection = null;
        }
        this.fastPoll();
      };

      TextareaInput.prototype.onContextMenu = function(e) {
        var input = this,
          cm = input.cm,
          display = cm.display,
          te = input.textarea;
        var pos = posFromMouse(cm, e),
          scrollPos = display.scroller.scrollTop;
        if (!pos || presto) {
          return
        } // Opera is difficult.

        // Reset the current text selection only if the click is done outside of the selection
        // and 'resetSelectionOnContextMenu' option is true.
        var reset = cm.options.resetSelectionOnContextMenu;
        if (reset && cm.doc.sel.contains(pos) == -1) {
          operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll);
        }

        var oldCSS = te.style.cssText,
          oldWrapperCSS = input.wrapper.style.cssText;
        input.wrapper.style.cssText = "position: absolute";
        var wrapperBox = input.wrapper.getBoundingClientRect();
        te.style.cssText = "position: absolute; width: 30px; height: 30px;\n      top: " + (e.clientY - wrapperBox.top - 5) + "px; left: " + (e.clientX - wrapperBox.left - 5) + "px;\n      z-index: 1000; background: " + (ie ? "rgba(255, 255, 255, .05)" : "transparent") + ";\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
        var oldScrollY;
        if (webkit) {
          oldScrollY = window.scrollY;
        } // Work around Chrome issue (#2712)
        display.input.focus();
        if (webkit) {
          window.scrollTo(null, oldScrollY);
        }
        display.input.reset();
        // Adds "Select all" to context menu in FF
        if (!cm.somethingSelected()) {
          te.value = input.prevInput = " ";
        }
        input.contextMenuPending = true;
        display.selForContextMenu = cm.doc.sel;
        clearTimeout(display.detectingSelectAll);

        // Select-all will be greyed out if there's nothing to select, so
        // this adds a zero-width space so that we can later check whether
        // it got selected.
        function prepareSelectAllHack() {
          if (te.selectionStart != null) {
            var selected = cm.somethingSelected();
            var extval = "\u200b" + (selected ? te.value : "");
            te.value = "\u21da"; // Used to catch context-menu undo
            te.value = extval;
            input.prevInput = selected ? "" : "\u200b";
            te.selectionStart = 1;
            te.selectionEnd = extval.length;
            // Re-set this, in case some other handler touched the
            // selection in the meantime.
            display.selForContextMenu = cm.doc.sel;
          }
        }

        function rehide() {
          input.contextMenuPending = false;
          input.wrapper.style.cssText = oldWrapperCSS;
          te.style.cssText = oldCSS;
          if (ie && ie_version < 9) {
            display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos);
          }

          // Try to detect the user choosing select-all
          if (te.selectionStart != null) {
            if (!ie || (ie && ie_version < 9)) {
              prepareSelectAllHack();
            }
            var i = 0,
              poll = function() {
                if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
                  te.selectionEnd > 0 && input.prevInput == "\u200b") {
                  operation(cm, selectAll)(cm);
                } else if (i++ < 10) {
                  display.detectingSelectAll = setTimeout(poll, 500);
                } else {
                  display.selForContextMenu = null;
                  display.input.reset();
                }
              };
            display.detectingSelectAll = setTimeout(poll, 200);
          }
        }

        if (ie && ie_version >= 9) {
          prepareSelectAllHack();
        }
        if (captureRightClick) {
          e_stop(e);
          var mouseup = function() {
            off(window, "mouseup", mouseup);
            setTimeout(rehide, 20);
          };
          on(window, "mouseup", mouseup);
        } else {
          setTimeout(rehide, 50);
        }
      };

      TextareaInput.prototype.readOnlyChanged = function(val) {
        if (!val) {
          this.reset();
        }
        this.textarea.disabled = val == "nocursor";
      };

      TextareaInput.prototype.setUneditable = function() {};

      TextareaInput.prototype.needsContentAttribute = false;

      function fromTextArea(textarea, options) {
        options = options ? copyObj(options) : {};
        options.value = textarea.value;
        if (!options.tabindex && textarea.tabIndex) {
          options.tabindex = textarea.tabIndex;
        }
        if (!options.placeholder && textarea.placeholder) {
          options.placeholder = textarea.placeholder;
        }
        // Set autofocus to true if this textarea is focused, or if it has
        // autofocus and no other element is focused.
        if (options.autofocus == null) {
          var hasFocus = activeElt();
          options.autofocus = hasFocus == textarea ||
            textarea.getAttribute("autofocus") != null && hasFocus == document.body;
        }

        function save() {
          textarea.value = cm.getValue();
        }

        var realSubmit;
        if (textarea.form) {
          on(textarea.form, "submit", save);
          // Deplorable hack to make the submit method do the right thing.
          if (!options.leaveSubmitMethodAlone) {
            var form = textarea.form;
            realSubmit = form.submit;
            try {
              var wrappedSubmit = form.submit = function() {
                save();
                form.submit = realSubmit;
                form.submit();
                form.submit = wrappedSubmit;
              };
            } catch (e) {}
          }
        }

        options.finishInit = function(cm) {
          cm.save = save;
          cm.getTextArea = function() {
            return textarea;
          };
          cm.toTextArea = function() {
            cm.toTextArea = isNaN; // Prevent this from being ran twice
            save();
            textarea.parentNode.removeChild(cm.getWrapperElement());
            textarea.style.display = "";
            if (textarea.form) {
              off(textarea.form, "submit", save);
              if (typeof textarea.form.submit == "function") {
                textarea.form.submit = realSubmit;
              }
            }
          };
        };

        textarea.style.display = "none";
        var cm = CodeMirror$1(function(node) {
            return textarea.parentNode.insertBefore(node, textarea.nextSibling);
          },
          options);
        return cm
      }

      function addLegacyProps(CodeMirror) {
        CodeMirror.off = off;
        CodeMirror.on = on;
        CodeMirror.wheelEventPixels = wheelEventPixels;
        CodeMirror.Doc = Doc;
        CodeMirror.splitLines = splitLinesAuto;
        CodeMirror.countColumn = countColumn;
        CodeMirror.findColumn = findColumn;
        CodeMirror.isWordChar = isWordCharBasic;
        CodeMirror.Pass = Pass;
        CodeMirror.signal = signal;
        CodeMirror.Line = Line;
        CodeMirror.changeEnd = changeEnd;
        CodeMirror.scrollbarModel = scrollbarModel;
        CodeMirror.Pos = Pos;
        CodeMirror.cmpPos = cmp;
        CodeMirror.modes = modes;
        CodeMirror.mimeModes = mimeModes;
        CodeMirror.resolveMode = resolveMode;
        CodeMirror.getMode = getMode;
        CodeMirror.modeExtensions = modeExtensions;
        CodeMirror.extendMode = extendMode;
        CodeMirror.copyState = copyState;
        CodeMirror.startState = startState;
        CodeMirror.innerMode = innerMode;
        CodeMirror.commands = commands;
        CodeMirror.keyMap = keyMap;
        CodeMirror.keyName = keyName;
        CodeMirror.isModifierKey = isModifierKey;
        CodeMirror.lookupKey = lookupKey;
        CodeMirror.normalizeKeyMap = normalizeKeyMap;
        CodeMirror.StringStream = StringStream;
        CodeMirror.SharedTextMarker = SharedTextMarker;
        CodeMirror.TextMarker = TextMarker;
        CodeMirror.LineWidget = LineWidget;
        CodeMirror.e_preventDefault = e_preventDefault;
        CodeMirror.e_stopPropagation = e_stopPropagation;
        CodeMirror.e_stop = e_stop;
        CodeMirror.addClass = addClass;
        CodeMirror.contains = contains;
        CodeMirror.rmClass = rmClass;
        CodeMirror.keyNames = keyNames;
      }

      // EDITOR CONSTRUCTOR

      defineOptions(CodeMirror$1);

      addEditorMethods(CodeMirror$1);

      // Set up methods on CodeMirror's prototype to redirect to the editor's document.
      var dontDelegate = "iter insert remove copy getEditor constructor".split(" ");
      for (var prop in Doc.prototype) {
        if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0) {
          CodeMirror$1.prototype[prop] = (function(method) {
            return function() {
              return method.apply(this.doc, arguments)
            }
          })(Doc.prototype[prop]);
        }
      }

      eventMixin(Doc);

      // INPUT HANDLING

      CodeMirror$1.inputStyles = {
        "textarea": TextareaInput,
        "contenteditable": ContentEditableInput
      };

      // MODE DEFINITION AND QUERYING

      // Extra arguments are stored as the mode's dependencies, which is
      // used by (legacy) mechanisms like loadmode.js to automatically
      // load a mode. (Preferred mechanism is the require/define calls.)
      CodeMirror$1.defineMode = function(name /*, mode, â€¦*/ ) {
        if (!CodeMirror$1.defaults.mode && name != "null") {
          CodeMirror$1.defaults.mode = name;
        }
        defineMode.apply(this, arguments);
      };

      CodeMirror$1.defineMIME = defineMIME;

      // Minimal default mode.
      CodeMirror$1.defineMode("null", function() {
        return ({
          token: function(stream) {
            return stream.skipToEnd();
          }
        });
      });
      CodeMirror$1.defineMIME("text/plain", "null");

      // EXTENSIONS

      CodeMirror$1.defineExtension = function(name, func) {
        CodeMirror$1.prototype[name] = func;
      };
      CodeMirror$1.defineDocExtension = function(name, func) {
        Doc.prototype[name] = func;
      };

      CodeMirror$1.fromTextArea = fromTextArea;

      addLegacyProps(CodeMirror$1);

      CodeMirror$1.version = "5.35.0";

      return CodeMirror$1;

    })));
  </script>
  <script type="text/javascript" once>
    // CodeMirror, copyright (c) by Marijn Haverbeke and others
    // Distributed under an MIT license: https://codemirror.net/LICENSE

    (function(mod) {
      if (typeof exports == "object" && typeof module == "object") // CommonJS
        mod(require("../../lib/codemirror"));
      else if (typeof define == "function" && define.amd) // AMD
        define(["../../lib/codemirror"], mod);
      else // Plain browser env
        mod(CodeMirror);
    })(function(CodeMirror) {
      "use strict";

      function wordRegexp(words) {
        return new RegExp("^((" + words.join(")|(") + "))\\b");
      }

      var wordOperators = wordRegexp(["and", "or", "not", "is"]);
      var commonKeywords = ["as", "assert", "break", "class", "continue",
        "def", "del", "elif", "else", "except", "finally",
        "for", "from", "global", "if", "import",
        "lambda", "pass", "raise", "return",
        "try", "while", "with", "yield", "in"
      ];
      var commonBuiltins = ["abs", "all", "any", "bin", "bool", "bytearray", "callable", "chr",
        "classmethod", "compile", "complex", "delattr", "dict", "dir", "divmod",
        "enumerate", "eval", "filter", "float", "format", "frozenset",
        "getattr", "globals", "hasattr", "hash", "help", "hex", "id",
        "input", "int", "isinstance", "issubclass", "iter", "len",
        "list", "locals", "map", "max", "memoryview", "min", "next",
        "object", "oct", "open", "ord", "pow", "property", "range",
        "repr", "reversed", "round", "set", "setattr", "slice",
        "sorted", "staticmethod", "str", "sum", "super", "tuple",
        "type", "vars", "zip", "__import__", "NotImplemented",
        "Ellipsis", "__debug__"
      ];
      CodeMirror.registerHelper("hintWords", "python", commonKeywords.concat(commonBuiltins));

      function top(state) {
        return state.scopes[state.scopes.length - 1];
      }

      CodeMirror.defineMode("python", function(conf, parserConf) {
        var ERRORCLASS = "error";

        var delimiters = parserConf.delimiters || parserConf.singleDelimiters || /^[\(\)\[\]\{\}@,:`=;\.\\]/;
        //               (Backwards-compatiblity with old, cumbersome config system)
        var operators = [parserConf.singleOperators, parserConf.doubleOperators, parserConf.doubleDelimiters, parserConf.tripleDelimiters,
          parserConf.operators || /^([-+*/%\/&|^]=?|[<>=]+|\/\/=?|\*\*=?|!=|[~!@])/
        ]
        for (var i = 0; i < operators.length; i++)
          if (!operators[i]) operators.splice(i--, 1)

        var hangingIndent = parserConf.hangingIndent || conf.indentUnit;

        var myKeywords = commonKeywords,
          myBuiltins = commonBuiltins;
        if (parserConf.extra_keywords != undefined)
          myKeywords = myKeywords.concat(parserConf.extra_keywords);

        if (parserConf.extra_builtins != undefined)
          myBuiltins = myBuiltins.concat(parserConf.extra_builtins);

        var py3 = !(parserConf.version && Number(parserConf.version) < 3)
        if (py3) {
          // since http://legacy.python.org/dev/peps/pep-0465/ @ is also an operator
          var identifiers = parserConf.identifiers || /^[_A-Za-z\u00A1-\uFFFF][_A-Za-z0-9\u00A1-\uFFFF]*/;
          myKeywords = myKeywords.concat(["nonlocal", "False", "True", "None", "async", "await"]);
          myBuiltins = myBuiltins.concat(["ascii", "bytes", "exec", "print"]);
          var stringPrefixes = new RegExp("^(([rbuf]|(br)|(fr))?('{3}|\"{3}|['\"]))", "i");
        } else {
          var identifiers = parserConf.identifiers || /^[_A-Za-z][_A-Za-z0-9]*/;
          myKeywords = myKeywords.concat(["exec", "print"]);
          myBuiltins = myBuiltins.concat(["apply", "basestring", "buffer", "cmp", "coerce", "execfile",
            "file", "intern", "long", "raw_input", "reduce", "reload",
            "unichr", "unicode", "xrange", "False", "True", "None"
          ]);
          var stringPrefixes = new RegExp("^(([rubf]|(ur)|(br))?('{3}|\"{3}|['\"]))", "i");
        }
        var keywords = wordRegexp(myKeywords);
        var builtins = wordRegexp(myBuiltins);

        // tokenizers
        function tokenBase(stream, state) {
          var sol = stream.sol() && state.lastToken != "\\"
          if (sol) state.indent = stream.indentation()
          // Handle scope changes
          if (sol && top(state).type == "py") {
            var scopeOffset = top(state).offset;
            if (stream.eatSpace()) {
              var lineOffset = stream.indentation();
              if (lineOffset > scopeOffset)
                pushPyScope(state);
              else if (lineOffset < scopeOffset && dedent(stream, state) && stream.peek() != "#")
                state.errorToken = true;
              return null;
            } else {
              var style = tokenBaseInner(stream, state);
              if (scopeOffset > 0 && dedent(stream, state))
                style += " " + ERRORCLASS;
              return style;
            }
          }
          return tokenBaseInner(stream, state);
        }

        function tokenBaseInner(stream, state) {
          if (stream.eatSpace()) return null;

          // Handle Comments
          if (stream.match(/^#.*/)) return "comment";

          // Handle Number Literals
          if (stream.match(/^[0-9\.]/, false)) {
            var floatLiteral = false;
            // Floats
            if (stream.match(/^[\d_]*\.\d+(e[\+\-]?\d+)?/i)) {
              floatLiteral = true;
            }
            if (stream.match(/^[\d_]+\.\d*/)) {
              floatLiteral = true;
            }
            if (stream.match(/^\.\d+/)) {
              floatLiteral = true;
            }
            if (floatLiteral) {
              // Float literals may be "imaginary"
              stream.eat(/J/i);
              return "number";
            }
            // Integers
            var intLiteral = false;
            // Hex
            if (stream.match(/^0x[0-9a-f_]+/i)) intLiteral = true;
            // Binary
            if (stream.match(/^0b[01_]+/i)) intLiteral = true;
            // Octal
            if (stream.match(/^0o[0-7_]+/i)) intLiteral = true;
            // Decimal
            if (stream.match(/^[1-9][\d_]*(e[\+\-]?[\d_]+)?/)) {
              // Decimal literals may be "imaginary"
              stream.eat(/J/i);
              // TODO - Can you have imaginary longs?
              intLiteral = true;
            }
            // Zero by itself with no other piece of number.
            if (stream.match(/^0(?![\dx])/i)) intLiteral = true;
            if (intLiteral) {
              // Integer literals may be "long"
              stream.eat(/L/i);
              return "number";
            }
          }

          // Handle Strings
          if (stream.match(stringPrefixes)) {
            var isFmtString = stream.current().toLowerCase().indexOf('f') !== -1;
            if (!isFmtString) {
              state.tokenize = tokenStringFactory(stream.current(), state.tokenize);
              return state.tokenize(stream, state);
            } else {
              state.tokenize = formatStringFactory(stream.current(), state.tokenize);
              return state.tokenize(stream, state);
            }
          }

          for (var i = 0; i < operators.length; i++)
            if (stream.match(operators[i])) return "operator"

          if (stream.match(delimiters)) return "punctuation";

          if (state.lastToken == "." && stream.match(identifiers))
            return "property";

          if (stream.match(keywords) || stream.match(wordOperators))
            return "keyword";

          if (stream.match(builtins))
            return "builtin";

          if (stream.match(/^(self|cls)\b/))
            return "variable-2";

          if (stream.match(identifiers)) {
            if (state.lastToken == "def" || state.lastToken == "class")
              return "def";
            return "variable";
          }

          // Handle non-detected items
          stream.next();
          return ERRORCLASS;
        }

        function formatStringFactory(delimiter, tokenOuter) {
          while ("rubf".indexOf(delimiter.charAt(0).toLowerCase()) >= 0)
            delimiter = delimiter.substr(1);

          var singleline = delimiter.length == 1;
          var OUTCLASS = "string";

          function tokenNestedExpr(depth) {
            return function(stream, state) {
              var inner = tokenBaseInner(stream, state)
              if (inner == "punctuation") {
                if (stream.current() == "{") {
                  state.tokenize = tokenNestedExpr(depth + 1)
                } else if (stream.current() == "}") {
                  if (depth > 1) state.tokenize = tokenNestedExpr(depth - 1)
                  else state.tokenize = tokenString
                }
              }
              return inner
            }
          }

          function tokenString(stream, state) {
            while (!stream.eol()) {
              stream.eatWhile(/[^'"\{\}\\]/);
              if (stream.eat("\\")) {
                stream.next();
                if (singleline && stream.eol())
                  return OUTCLASS;
              } else if (stream.match(delimiter)) {
                state.tokenize = tokenOuter;
                return OUTCLASS;
              } else if (stream.match('{{')) {
                // ignore {{ in f-str
                return OUTCLASS;
              } else if (stream.match('{', false)) {
                // switch to nested mode
                state.tokenize = tokenNestedExpr(0)
                if (stream.current()) return OUTCLASS;
                else return state.tokenize(stream, state)
              } else if (stream.match('}}')) {
                return OUTCLASS;
              } else if (stream.match('}')) {
                // single } in f-string is an error
                return ERRORCLASS;
              } else {
                stream.eat(/['"]/);
              }
            }
            if (singleline) {
              if (parserConf.singleLineStringErrors)
                return ERRORCLASS;
              else
                state.tokenize = tokenOuter;
            }
            return OUTCLASS;
          }
          tokenString.isString = true;
          return tokenString;
        }

        function tokenStringFactory(delimiter, tokenOuter) {
          while ("rubf".indexOf(delimiter.charAt(0).toLowerCase()) >= 0)
            delimiter = delimiter.substr(1);

          var singleline = delimiter.length == 1;
          var OUTCLASS = "string";

          function tokenString(stream, state) {
            while (!stream.eol()) {
              stream.eatWhile(/[^'"\\]/);
              if (stream.eat("\\")) {
                stream.next();
                if (singleline && stream.eol())
                  return OUTCLASS;
              } else if (stream.match(delimiter)) {
                state.tokenize = tokenOuter;
                return OUTCLASS;
              } else {
                stream.eat(/['"]/);
              }
            }
            if (singleline) {
              if (parserConf.singleLineStringErrors)
                return ERRORCLASS;
              else
                state.tokenize = tokenOuter;
            }
            return OUTCLASS;
          }
          tokenString.isString = true;
          return tokenString;
        }

        function pushPyScope(state) {
          while (top(state).type != "py") state.scopes.pop()
          state.scopes.push({
            offset: top(state).offset + conf.indentUnit,
            type: "py",
            align: null
          })
        }

        function pushBracketScope(stream, state, type) {
          var align = stream.match(/^([\s\[\{\(]|#.*)*$/, false) ? null : stream.column() + 1
          state.scopes.push({
            offset: state.indent + hangingIndent,
            type: type,
            align: align
          })
        }

        function dedent(stream, state) {
          var indented = stream.indentation();
          while (state.scopes.length > 1 && top(state).offset > indented) {
            if (top(state).type != "py") return true;
            state.scopes.pop();
          }
          return top(state).offset != indented;
        }

        function tokenLexer(stream, state) {
          if (stream.sol()) state.beginningOfLine = true;

          var style = state.tokenize(stream, state);
          var current = stream.current();

          // Handle decorators
          if (state.beginningOfLine && current == "@")
            return stream.match(identifiers, false) ? "meta" : py3 ? "operator" : ERRORCLASS;

          if (/\S/.test(current)) state.beginningOfLine = false;

          if ((style == "variable" || style == "builtin") &&
            state.lastToken == "meta")
            style = "meta";

          // Handle scope changes.
          if (current == "pass" || current == "return")
            state.dedent += 1;

          if (current == "lambda") state.lambda = true;
          if (current == ":" && !state.lambda && top(state).type == "py")
            pushPyScope(state);

          if (current.length == 1 && !/string|comment/.test(style)) {
            var delimiter_index = "[({".indexOf(current);
            if (delimiter_index != -1)
              pushBracketScope(stream, state, "])}".slice(delimiter_index, delimiter_index + 1));

            delimiter_index = "])}".indexOf(current);
            if (delimiter_index != -1) {
              if (top(state).type == current) state.indent = state.scopes.pop().offset - hangingIndent
              else return ERRORCLASS;
            }
          }
          if (state.dedent > 0 && stream.eol() && top(state).type == "py") {
            if (state.scopes.length > 1) state.scopes.pop();
            state.dedent -= 1;
          }

          return style;
        }

        var external = {
          startState: function(basecolumn) {
            return {
              tokenize: tokenBase,
              scopes: [{
                offset: basecolumn || 0,
                type: "py",
                align: null
              }],
              indent: basecolumn || 0,
              lastToken: null,
              lambda: false,
              dedent: 0
            };
          },

          token: function(stream, state) {
            var addErr = state.errorToken;
            if (addErr) state.errorToken = false;
            var style = tokenLexer(stream, state);

            if (style && style != "comment")
              state.lastToken = (style == "keyword" || style == "punctuation") ? stream.current() : style;
            if (style == "punctuation") style = null;

            if (stream.eol() && state.lambda)
              state.lambda = false;
            return addErr ? style + " " + ERRORCLASS : style;
          },

          indent: function(state, textAfter) {
            if (state.tokenize != tokenBase)
              return state.tokenize.isString ? CodeMirror.Pass : 0;

            var scope = top(state),
              closing = scope.type == textAfter.charAt(0)
            if (scope.align != null)
              return scope.align - (closing ? 1 : 0)
            else
              return scope.offset - (closing ? hangingIndent : 0)
          },

          electricInput: /^\s*[\}\]\)]$/,
          closeBrackets: {
            triples: "'\""
          },
          lineComment: "#",
          fold: "indent"
        };
        return external;
      });

      CodeMirror.defineMIME("text/x-python", "python");

      var words = function(str) {
        return str.split(" ");
      };

      CodeMirror.defineMIME("text/x-cython", {
        name: "python",
        extra_keywords: words("by cdef cimport cpdef ctypedef enum except " +
          "extern gil include nogil property public " +
          "readonly struct union DEF IF ELIF ELSE")
      });

    });
  </script>
  <style type="text/css" once>
    .CodeMirror {
      font-family: monospace;
      height: 300px;
      color: black;
      direction: ltr
    }

    .CodeMirror-lines {
      padding: 4px 0
    }

    .CodeMirror pre {
      padding: 0 4px
    }

    .CodeMirror-scrollbar-filler,
    .CodeMirror-gutter-filler {
      background-color: white
    }

    .CodeMirror-gutters {
      border-right: 1px solid #ddd;
      background-color: #f7f7f7;
      white-space: nowrap
    }

    .CodeMirror-linenumber {
      padding: 0 3px 0 5px;
      min-width: 20px;
      text-align: right;
      color: #999;
      white-space: nowrap
    }

    .CodeMirror-guttermarker {
      color: black
    }

    .CodeMirror-guttermarker-subtle {
      color: #999
    }

    .CodeMirror-cursor {
      border-left: 1px solid black;
      border-right: none;
      width: 0
    }

    .CodeMirror div.CodeMirror-secondarycursor {
      border-left: 1px solid silver
    }

    .cm-fat-cursor .CodeMirror-cursor {
      width: auto;
      border: 0 !important;
      background: #7e7
    }

    .cm-fat-cursor div.CodeMirror-cursors {
      z-index: 1
    }

    .cm-fat-cursor-mark {
      background-color: rgba(20, 255, 20, 0.5);
      -webkit-animation: blink 1.06s steps(1) infinite;
      -moz-animation: blink 1.06s steps(1) infinite;
      animation: blink 1.06s steps(1) infinite
    }

    .cm-animate-fat-cursor {
      width: auto;
      border: 0;
      -webkit-animation: blink 1.06s steps(1) infinite;
      -moz-animation: blink 1.06s steps(1) infinite;
      animation: blink 1.06s steps(1) infinite;
      background-color: #7e7
    }

    @-moz-keyframes blink {
      0% {}

      50% {
        background-color: transparent
      }

      100% {}
    }

    @-webkit-keyframes blink {
      0% {}

      50% {
        background-color: transparent
      }

      100% {}
    }

    @keyframes blink {
      0% {}

      50% {
        background-color: transparent
      }

      100% {}
    }

    .cm-tab {
      display: inline-block;
      text-decoration: inherit
    }

    .CodeMirror-rulers {
      position: absolute;
      left: 0;
      right: 0;
      top: -50px;
      bottom: -20px;
      overflow: hidden
    }

    .CodeMirror-ruler {
      border-left: 1px solid #ccc;
      top: 0;
      bottom: 0;
      position: absolute
    }

    .cm-s-default .cm-header {
      color: blue
    }

    .cm-s-default .cm-quote {
      color: #090
    }

    .cm-negative {
      color: #d44
    }

    .cm-positive {
      color: #292
    }

    .cm-header,
    .cm-strong {
      font-weight: bold
    }

    .cm-em {
      font-style: italic
    }

    .cm-link {
      text-decoration: underline
    }

    .cm-strikethrough {
      text-decoration: line-through
    }

    .cm-s-default .cm-keyword {
      color: #708
    }

    .cm-s-default .cm-atom {
      color: #219
    }

    .cm-s-default .cm-number {
      color: #164
    }

    .cm-s-default .cm-def {
      color: #00f
    }

    .cm-s-default .cm-variable-2 {
      color: #05a
    }

    .cm-s-default .cm-variable-3,
    .cm-s-default .cm-type {
      color: #085
    }

    .cm-s-default .cm-comment {
      color: #a50
    }

    .cm-s-default .cm-string {
      color: #a11
    }

    .cm-s-default .cm-string-2 {
      color: #f50
    }

    .cm-s-default .cm-meta {
      color: #555
    }

    .cm-s-default .cm-qualifier {
      color: #555
    }

    .cm-s-default .cm-builtin {
      color: #30a
    }

    .cm-s-default .cm-bracket {
      color: #997
    }

    .cm-s-default .cm-tag {
      color: #170
    }

    .cm-s-default .cm-attribute {
      color: #00c
    }

    .cm-s-default .cm-hr {
      color: #999
    }

    .cm-s-default .cm-link {
      color: #00c
    }

    .cm-s-default .cm-error {
      color: #f00
    }

    .cm-invalidchar {
      color: #f00
    }

    .CodeMirror-composing {
      border-bottom: 2px solid
    }

    div.CodeMirror span.CodeMirror-matchingbracket {
      color: #0b0
    }

    div.CodeMirror span.CodeMirror-nonmatchingbracket {
      color: #a22
    }

    .CodeMirror-matchingtag {
      background: rgba(255, 150, 0, 0.3)
    }

    .CodeMirror-activeline-background {
      background: #e8f2ff
    }

    .CodeMirror {
      position: relative;
      overflow: hidden;
      background: white
    }

    .CodeMirror-scroll {
      overflow: scroll !important;
      margin-bottom: -30px;
      margin-right: -30px;
      padding-bottom: 30px;
      height: 100%;
      outline: none;
      position: relative
    }

    .CodeMirror-sizer {
      position: relative;
      border-right: 30px solid transparent
    }

    .CodeMirror-vscrollbar,
    .CodeMirror-hscrollbar,
    .CodeMirror-scrollbar-filler,
    .CodeMirror-gutter-filler {
      position: absolute;
      z-index: 6;
      display: none
    }

    .CodeMirror-vscrollbar {
      right: 0;
      top: 0;
      overflow-x: hidden;
      overflow-y: scroll
    }

    .CodeMirror-hscrollbar {
      bottom: 0;
      left: 0;
      overflow-y: hidden;
      overflow-x: scroll
    }

    .CodeMirror-scrollbar-filler {
      right: 0;
      bottom: 0
    }

    .CodeMirror-gutter-filler {
      left: 0;
      bottom: 0
    }

    .CodeMirror-gutters {
      position: absolute;
      left: 0;
      top: 0;
      min-height: 100%;
      z-index: 3
    }

    .CodeMirror-gutter {
      white-space: normal;
      height: 100%;
      display: inline-block;
      vertical-align: top;
      margin-bottom: -30px
    }

    .CodeMirror-gutter-wrapper {
      position: absolute;
      z-index: 4;
      background: none !important;
      border: none !important
    }

    .CodeMirror-gutter-background {
      position: absolute;
      top: 0;
      bottom: 0;
      z-index: 4
    }

    .CodeMirror-gutter-elt {
      position: absolute;
      cursor: default;
      z-index: 4
    }

    .CodeMirror-gutter-wrapper ::selection {
      background-color: transparent
    }

    .CodeMirror-gutter-wrapper ::-moz-selection {
      background-color: transparent
    }

    .CodeMirror-lines {
      cursor: text;
      min-height: 1px
    }

    .CodeMirror pre {
      -moz-border-radius: 0;
      -webkit-border-radius: 0;
      border-radius: 0;
      border-width: 0;
      background: transparent;
      font-family: inherit;
      font-size: inherit;
      margin: 0;
      white-space: pre;
      word-wrap: normal;
      line-height: inherit;
      color: inherit;
      z-index: 2;
      position: relative;
      overflow: visible;
      -webkit-tap-highlight-color: transparent;
      -webkit-font-variant-ligatures: contextual;
      font-variant-ligatures: contextual
    }

    .CodeMirror-wrap pre {
      word-wrap: break-word;
      white-space: pre-wrap;
      word-break: normal
    }

    .CodeMirror-linebackground {
      position: absolute;
      left: 0;
      right: 0;
      top: 0;
      bottom: 0;
      z-index: 0
    }

    .CodeMirror-linewidget {
      position: relative;
      z-index: 2;
      padding: 0.1px
    }

    .CodeMirror-rtl pre {
      direction: rtl
    }

    .CodeMirror-code {
      outline: none
    }

    .CodeMirror-scroll,
    .CodeMirror-sizer,
    .CodeMirror-gutter,
    .CodeMirror-gutters,
    .CodeMirror-linenumber {
      -moz-box-sizing: content-box;
      box-sizing: content-box
    }

    .CodeMirror-measure {
      position: absolute;
      width: 100%;
      height: 0;
      overflow: hidden;
      visibility: hidden
    }

    .CodeMirror-cursor {
      position: absolute;
      pointer-events: none
    }

    .CodeMirror-measure pre {
      position: static
    }

    div.CodeMirror-cursors {
      visibility: hidden;
      position: relative;
      z-index: 3
    }

    div.CodeMirror-dragcursors {
      visibility: visible
    }

    .CodeMirror-focused div.CodeMirror-cursors {
      visibility: visible
    }

    .CodeMirror-selected {
      background: #d9d9d9
    }

    .CodeMirror-focused .CodeMirror-selected {
      background: #d7d4f0
    }

    .CodeMirror-crosshair {
      cursor: crosshair
    }

    .CodeMirror-line::selection,
    .CodeMirror-line>span::selection,
    .CodeMirror-line>span>span::selection {
      background: #d7d4f0
    }

    .CodeMirror-line::-moz-selection,
    .CodeMirror-line>span::-moz-selection,
    .CodeMirror-line>span>span::-moz-selection {
      background: #d7d4f0
    }

    .cm-searching {
      background-color: #ffa;
      background-color: rgba(255, 255, 0, 0.4)
    }

    .cm-force-border {
      padding-right: .1px
    }

    @media print {
      .CodeMirror div.CodeMirror-cursors {
        visibility: hidden
      }
    }

    .cm-tab-wrap-hack:after {
      content: ''
    }

    span.CodeMirror-selectedtext {
      background: none
    }
  </style>
  <textarea id='demotext' class="code-pad">## create new project
$ mkdir test_example
$ cd test_example
$ npm init
$ npm install ../example
$ touch index.js

add to index.js

var ex = require(‘example’);
console.log(new ex(‘hello’).excit())

setup git

$ git init
$ git add .
$ commit -m "init example"
$ touch .gitignore
$ touch .npmignore

add to .gitignore

.DS_STORE
node_modules
build/
.module-cache
*.log*
lib

add to .npmignore

node_modules
src

Sign up for git up at github.com

Create example repo

$ git remote add origin git@github.com:kevinponce/example.git

Check if it add remote origin

$ git remote -v

setup npm for project

$ npm adduser
$ npm publish

If that fails, change project name package.json to be like "name": "@your_username/example"

Voila

{tag}